WO2003027828A1 - Procede d'ecriture de donnees dans une memoire non volatile - Google Patents

Procede d'ecriture de donnees dans une memoire non volatile Download PDF

Info

Publication number
WO2003027828A1
WO2003027828A1 PCT/GB2002/004381 GB0204381W WO03027828A1 WO 2003027828 A1 WO2003027828 A1 WO 2003027828A1 GB 0204381 W GB0204381 W GB 0204381W WO 03027828 A1 WO03027828 A1 WO 03027828A1
Authority
WO
WIPO (PCT)
Prior art keywords
volatile memory
sector
block
blocks
sectors
Prior art date
Application number
PCT/GB2002/004381
Other languages
English (en)
Inventor
Sergey Anatolievich Gorobets
Alan David Bennett
Alan Welsh Sinclair
Original Assignee
Lexar Media, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lexar Media, Inc. filed Critical Lexar Media, Inc.
Priority to EP02760436A priority Critical patent/EP1430386B1/fr
Priority to DE60217883T priority patent/DE60217883T2/de
Publication of WO2003027828A1 publication Critical patent/WO2003027828A1/fr

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/02—Addressing or allocation; Relocation
    • G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
    • G06F12/023—Free address space management
    • G06F12/0238—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory
    • G06F12/0246—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory in block erasable memory, e.g. flash memory
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
    • G06F3/061—Improving I/O performance
    • G06F3/0613—Improving I/O performance in relation to throughput
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
    • G06F3/0614—Improving the reliability of storage systems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
    • G06F3/0614—Improving the reliability of storage systems
    • G06F3/0616—Improving the reliability of storage systems in relation to life time, e.g. increasing Mean Time Between Failures [MTBF]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
    • G06F3/0638—Organizing or formatting or addressing of data
    • G06F3/064—Management of blocks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
    • G06F3/0671—In-line storage system
    • G06F3/0673—Single storage device
    • G06F3/0679—Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
    • G06F3/0671—In-line storage system
    • G06F3/0683—Plurality of storage devices
    • G06F3/0688—Non-volatile semiconductor memory arrays
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C16/00—Erasable programmable read-only memories
    • G11C16/02—Erasable programmable read-only memories electrically programmable
    • G11C16/06—Auxiliary circuits, e.g. for writing into memory
    • G11C16/10—Programming or data input circuits
    • G11C16/102—External programming circuits, e.g. EPROM programmers; In-circuit programming or reprogramming; EPROM emulators
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C16/00—Erasable programmable read-only memories
    • G11C16/02—Erasable programmable read-only memories electrically programmable
    • G11C16/06—Auxiliary circuits, e.g. for writing into memory
    • G11C16/34—Determination of programming status, e.g. threshold voltage, overprogramming or underprogramming, retention
    • G11C16/349—Arrangements for evaluating degradation, retention or wearout, e.g. by counting erase cycles
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
    • G06F2212/72—Details relating to flash memory management
    • G06F2212/7201—Logical to physical mapping or translation of blocks or pages
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
    • G06F2212/72—Details relating to flash memory management
    • G06F2212/7203—Temporary buffering, e.g. using volatile buffer or dedicated buffer blocks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
    • G06F2212/72—Details relating to flash memory management
    • G06F2212/7211—Wear leveling

Definitions

  • the present invention relates to a method of writing data to non volatile memory and in particular to a method of writing data to flash memory in order to ensure the uniform distribution of use over a prolonged period of operation .
  • non volatile memory such as the flash memory of the memory systems to* " ⁇ " have wear out mechanisms within their physical structures which mean that a block within the flash memory may experience failure after a cumulative number of operations.
  • known data management methods typically do not perform block erasure in Flash memory in real time leading to the accumulation of blocks in Flash memory which contain obsolete versions of sectors.
  • the physical address for writing a sector is dependant on the logical address of the sector thus logically non-contiguous sectors are written in non-contiguous physical address and logical to physical.
  • an object of the present invention is to reduce the number of read and write accesses to the non-volatile memory for control data structures, thereby increasing the write speed of the memory system for host data .
  • a second object of the invention is to obtain even use of blocks in the non-volatile memory for storage of data over a long period of operation, and to avoid "hot- spots" in non-volatile memory usage, thereby increasing the reliability of the memory system.
  • a controller connected to a non-volatile memory and including a volatile memory, wherein the controller maintains lists in volatile memory of blocks in the non-volatile memory allovated for storage of logical sector data and of blocks recently erased in the non-volatile memory the controller transfers information from the lists in volatile memory to control data structures in the nonvolatile memory less frequently than the contents of the lists in volatile memory are changed such that the lists in volatile memory can be reconstructed at any time from existing infor ⁇ taion in the non-volatile memory.
  • information from the lists in volatile memory is transferred to control data structures in the non-volatile memory concurrently with logical to physical mapping information for sectors from other lists in volatile memory.
  • a controller connected to a non-volatile memory and including a volatile memory, wherein the controller maintains a first list of all blocks in the non-volatile memory which are in the erased state and which are not included in other lists the controller maintains a second list of blocks in the non-volatile memory which have been recently erased.
  • FIG. 1 - a host system and flash memory system arrangement which the present invention is implemented
  • FIG. 2 the hardware architecture of the controller of the system of Figure 1 in which the .present invention is implemented;
  • Figure 3 the layered firmware structure which performs the media management operations according to the present invention
  • FIG. 4a schematic representation of the write operation according to the present invention
  • Figure 4b schematic representation of the write and relocate operations of the present invention
  • Figure 5 - a schematic representation of the three level hierarchy of mapping structures of the address translation process according to the present invention
  • Figure 6 a schematic representation of the data structures in the memory system of the present invention.
  • FIG. 7 - a schematic representation of the control operations of the memory system according to the present invention.
  • Figure 8 - a schematic representation of the flow of operations of the address translation operation of the present invention.
  • Figure 9 A schematic representation of the control write operation of the memory system according to the present invention.
  • Figure 10 - a schematic representation of the EBM sector write function operation of the memory system of the present invention
  • Figure 11 a schematic representation of the state of the data structures at the start of a map write operation
  • Figure 12 a schematic representation of the state of the data structures following the CB map operation
  • Figure 13 a schematic representation of the state of the data structures following ' the ABL and CBL compaction operation
  • Figure 14 - a schematic representation of the state of the data structure following the map to CBL operation
  • Figure 15 - a schematic representation of the state of the data structures following the CBL to EBL operation
  • Figure 16 - a schematic representation of the state of the data structures following the EBL to ABL operation
  • FIG 17 - a schematic representation of an alternative host system and flash system in which the present invention may be implemented.
  • a Flash disk device such as that shown in Figure 1 . is a memory system which presents the logical characteristics of a disk storage device to a host system 12, and which uses Flash semiconductor memory 20 as its physical data storage medium.
  • a Flash disk memory system 10 requires a controller 12 to manage the physical storage medium of the system 10 according to algorithms which create the logical characteristics of a disk and, in this case, it is the flash memory 20 and controller 16 which are connected by physical interface 16 which form the memory system 10.
  • the controller 16 of the memory system 10 connects the system 10 to the host 12 via logical interface 14.
  • the flash memory 20 comprises a plurality of flash chips which are formed of a plurality of flash blocks.
  • the logical interface 14 to the memory system 10 allows data to be written to and read from the system 10 in fixed-size units called sectors, each containing 512 bytes of data, which can be randomly accessed. Each sector is identified by a logical address which in this case is a sequential Logical Block Address
  • data may be written to a sector even if the sector already contains data.
  • the protocols at the logical interface 14 can, in this case, support, read or write access to the system 10 in multi- sector blocks of logically contiguous sector addresses, these protocols conform to industry standards such as ATA, CompactFlash, or MultiMediaCard thus allowing the memory system 10 to be interchangeable between different host systems and not limited to use with host 12.
  • the physical interface 18 from controller 16 to Flash Memory 20 allows data to be written to and read from Flash memory 20 in fixed-size units which in this case are called physical sectors and each of which can be accessed randomly with each typically having sufficient capacity for 512 bytes of data from the host system plus 16 bytes of overhead data appended by the controller 16.
  • Each physical sector is identified by a physical sector address, which normally has separate components which respectively identify the Flash chip within the memory subsystem, the Flash block within the Flash chip, and the physical sector within the Flash block of the " memory 20 to which the physical sector is written.
  • data may only be written to a physical sector if the sector has previously been erased.
  • the Flash memory 20 is erased in response to a command at the physical interface in units of a Flash block, which typically contains 32 physical sectors.
  • the relative times for performing operations within the Flash system 10 to read a physical sector, program a physical sector, and erase a Flash block are typically in the ratio 1 : 20 : 200.
  • controller 16 is a Cyclic Storage controller which is a Flash media management controller in which a method of ensuring uniformity of distribution of use is implemented wherein the media management algorithms which implement this method are implemented as firmware by a processor within the controller.
  • controller hardware is a dedicated architecture in a separate integrated circuit.
  • the controller 16 comprises host interface control block' 22, microprocessor 24, flash interface control block 26, ROM 28, SRAM 30 and expansion port- 32, each of these being inter-connected by memory access control bus 34.
  • Cyclic Storage Flash media management algorithms are implemented by firmware running on microprocessor 24 and the controller 16 is responsible for all Flash media management functions and for the characteristics of the logical interface 14 presented to host 12.
  • the host interface control block 22 provides the path for data flow to and from host system 12 via logical interface 14.
  • the controller 16 is in the form of a dedicated integrated circuit
  • the host interface control block 22 provides logical interface 14 which conforms to an industry standard protocol as well as a command register and set of taskfile registers which provide the route for the microprocessor 24 to control the logical characteristics of the interface 14.
  • the host interface control block 22 also allows for a sector of data to be transferred in either direction across the logical interface 14 between to the host system 12 and the controller' s SRAM 30 by a direct memory access (DMA) operation without intervention from the microprocessor 24.
  • DMA direct memory access
  • the Flash interface control block 26 provides the path for data flow to and from Flash memory 20, and controls all operations which take place in the Flash memory 20.
  • the operations taking place in Flash memory 20 are defined and initiated by the microprocessor 24, which loads parameter and address information to the flash interface control block 26.
  • the set of operations which typically take place are the transfer of a physical sector to Flash memory 20, the
  • a physical sector of data may be transferred in either direction across the physical interface 16 between the Flash memory 20 and the controller's SRAM 30 by DMA operations without intervention from the microprocessor 24.
  • the organization of the 512 bytes of host data and 16 bytes of overhead data within a physical sector which is transferred to Flash memory 20 is determined within the
  • Flash interface control block 26 under the control of parameters loaded by the microprocessor 24.
  • the Flash interface control block 26 also generates a 12-byte error correcting code (ECC) which is transferred to Flash memory 20 and programmed as overhead data within each physical sector, and which is also verified when a physical sector is transferred from Flash memory 20.
  • ECC error correcting code
  • the microprocessor 24 controls the flow of data sectors through the memory access control bus, or datapath, 34 or of the controller 16, implements the Flash media management algorithms which define the sector and control data storage organisation in the Flash memory 20, and defines the a characteristics of the logical interface 14 to host system 12.
  • the microprocessor 24 is a 32-bit RISC processor.
  • the memory access control bus 34 allows transfer of information between the microprocessor 24, host interface control block 22, and the Flash interface control blocks
  • the microprocessor 24, host interface control block 22, and Flash interface control block 26 may each be the master for a transaction on the memory access control bus 34. Bus access is granted to requesting masters on a cycle-by-cycle basis.
  • the SRAM block 30 stores all temporary information within the controller 16, this storing function includes the buffering of sector data and storage of control data structures and variables, as well as firmware code.
  • the ROM 28 is. included in the controller 16 for storage of code for execution by the microprocessor 24, or of information required by other hardware blocks within the controller.
  • the host interface control block 22 provides a logical interface which conforms to an industry standard protocol, and a command register and set of taskfile registers provide the route for the microprocessor 24 to control the logical characteristics of the interface 14.
  • Command, address and parameter information is written to these task file registers by the host 12, and read by the microprocessor 24 for execution of the command. Information is also be written to the registers by the microprocessor 24 for return to the host 12.
  • FIG. 3 there is illustrated the layered structure of the firmware which performs the Cyclic Storage Flash media management operations.
  • the firmware has three layers, the first being the host interface layer 40, the second layer 42 comprising the sector transfer sequencer 42a and the media management layer 42b and the third being the flash control layer 44.
  • firmware layers 40,42 and 44 control the transfer of data sectors between the logical interface 14 to host 12 and the physical interface 18 to Flash memory 20.
  • firmware layers do not directly pass data, instead data sectors are transferred by the hardware blocks of the controller 16 and therefore do not pass through the microprocessor 24.
  • the host interface layer 40 supports the full command set for the host protocol. It interprets commands at the host interface 14, controls the logical behaviour of the interface 14 according to host protocols, executes host commands not associated with the transfer of data, and passes host commands which relate to data in Flash memory to be invoked in the layers below. Example of such commands are.
  • the sector transfer sequencer 42a receives interpreted commands relating to logical data sectors from the host interface layer 40 and thus invokes the
  • Flash media management layer 42b for logical to physical transformation operations, and invokes the Flash control layer for physical sector transfers ⁇ to or from Flash memory.
  • the sector transfer sequencer 42a also perform sector buffer memory management. Another function of the sequencer 42a is to create a sequence of sector transfers, at the host interface 14 and Flash memory interface 18, and a sequence of operations in the media management layer 42b, in accordance with the command received from the host 12 and the level of concurrent operations which is configured for the Flash memory 20.
  • the media management layer 42b performs the logical to physical transformation operations which are required to support the write, read or erasure of a single logical sector. This layer is responsible for the implementation of Cyclic Storage media management algorithms.
  • the Flash control layer 44 configures the Flash interface control block 26 hardware to execute operations according to calls from the sector transfer sequencer 42a or media management layer 42b.
  • the media management functions which are implemented within the media management layer 42b of the controller firmware create the logical characteristics of a disk storage device in the memory system 10 which uses Flash semiconductor memory 20 as the physical data storage medium.
  • the effectiveness of the media management performed by the media management functions of the media management layer 42b is measured by its speed for performing sustained writing of data to the memory system 10, its efficiency in maintaining its level of performance when operating with different file systems, and in this case, in host 12, and the long-term reliability of the Flash memory 20.
  • Data write speed is defined as the speed which can be sustained when writing a large volume of contiguous data to the memory system 10. In some cases, when the sustained data write rate of a memory system is being tested, the volume of data to be written may exceed the capacity of the memory system 10 and therefore logical addresses may be repeated.
  • Sustained write speed is determined by the sector data transfer speed at the logical interface 14 to the host 12, and the physical interface 18 to Flash memory 20, as well as the overhead percentage of accesses to
  • control data structures and algorithms which are employed should ensure that access to Flash memory 20 for control functions is required at a much lower frequency than for host sector write.
  • the sustained write speed is also determined by the processing time within the controller 16 for media management operations, and the page read and program times, and block erase times within the Flash memory 20.
  • Flash memory 20 are appropriately defined and data write performance is maintained in each environment.
  • the file systems implementing the MS-DOS standard are provided with at least one of the following characteristics: the host 12 writing data sectors in clusters using multiple sector write commands; the host 12 writing data sectors using single sector write commands; the host 12 writing some sectors with single sector write commands in an address space which is shared with clustered file data; the host 12 writing noncontiguous sectors for MS-DOS directory and FAT entries with single sector write commands; the host 12 writing non-contiguous sectors for MS-DOS directory and FAT entries interspersed with contiguous sectors for file data; and/or
  • the host may rewrite sectors for MS-DOS directory and FAT entries on a frequent basis.
  • Flash memory 20 of the memory system 10 It is a feature of flash memory, and in this case the Flash memory 20 of the memory system 10, that it has a wear-out mechanism within the physical structure of its cells whereby a block of flash memory may experience failure after a cumulative number of operations. Typically, this is in the range of 100,000 to 1,000,000 program/erase cycles .
  • the cyclic storage controller 16 of the present arrangement implements a process of wear-leveling to ensure that "hot-spots" do not occur in the physical address space of the Flash memory 20 and that utilization of Flash blocks is uniformly distributed over a prolonged period of operation .
  • the Cyclic Storage media management algorithms are implemented within memory system 10 and perform the Media management operation of the physical Flash memory 20 within the system 10.
  • the cyclic storage media management algorithms comprise four separate algorithms, namely the
  • Cyclic Storage media management implemented by these algorithms embodies the principle that data is written at physical sector locations m Flash memory 20 which follow the same order as the sequence m which the data is written. This is achieved by writing each logical data sector at a physical sector position defined by a cyclic write pointer.
  • FIG. 4A A schematic representation of the write operation of the cyclic storage media management method is shown in Figures 4A.
  • the write pointer, in this case data write pointer (DWP) 46 moves sequentially through the sector positions of Flash block X in Flash memory 20, and continues through the chain of blocks Y and Z in a manner defined by the block sequencing algorithm.
  • Each block X, Y and Z is a physical structure in Flash memory 20 which, in this case, comprises 32 sector locations which can be erased in a single operation.
  • Logical data sectors are generally written in files by a file system in the host 12, and the Cyclic Storage Data Write Algorithm locates the first sector of a file at the next available physical sector position following the last sector of the preceding file.
  • the Cyclic Storage Data Write Algorithm locates the first sector of a file at the next available physical sector position following the last sector of the preceding file.
  • a second write pointer in this case data relocate pointer DRP 47 is used for writing relocated sectors in order to avoid sectors of one file fragmenting a block containing sectors of another file.
  • the use of a separate relocation pointer significantly reduces the fragmentation of blocks containing a file, leading to minimum requirement for sector relocation and consequent maximum file write performance.
  • a host file system is used which also writes sectors containing system information, such as directory or FAT sectors in the DOS file system, and these are generally written immediately before and after a group of sectors forming a file.
  • a separate system pointer, system write pointer SWP 48 is used for this host file system in order to define the physical write location for system sectors, which are identified by their logical address, in order to separate system sectors from file data sectors and avoid them being treated in the same way. This avoids a small group of system sectors being "sandwiched" between the tail of one file and the head of another. These system sectors contain information about many files, and are generally re-written much more frequently than data for a file. "Sandwiched" system sectors would cause frequent relocation of file data sectors and thus the use of system pointer SWP 48 minimises the requirement for data sector relocation and maximises file write performance .
  • a fourth pointer, system relocate pointer SRP 49 is used for relocation of system sectors, analogous to the relocation pointer DPP 47 for file data sectors. To summarise the four write pointers are:
  • Data write pointer DWP 46 which is used to define the physical location for writing file data sectors transmitted by a host system
  • SWP 48 System write pointer, SWP 48 which is used to define the physical location for writing system sectors transmitted by a host system wherein system sectors are identified by their logical address, in accordance with the characteristics of the host file system in use;
  • DRP 47 Data relocation pointer, DRP 47 which is used to define the physical location for writing file data sectors which must occasionally be relocated prior to a block erasure for recovery of capacity occupied by obsolete file data sectors;
  • SRP 49 System relocation pointer, SRP 49 which is used to define the physical location for writing system sectors which are being relocated prior to a block erasure for recovery of capacity occupied by obsolete system sectors.
  • a block must contain data associated with only a single write pointer and this results in four separate chains of blocks existing, one for each write pointer, this is shown in Figure. 4b.
  • the same write and relocation algorithms of the cyclic storage algorithms apply to each write pointer 46, 47, 48 and 49.
  • This scheme for locating a sector to be written at the first available location following the preceding sector, combined with usage of multiple write pointers, is fully flexible, and provides high performance and total compatibility for all host write configurations, including single sector data and data in clusters of any size .
  • Cyclic Storage media management method is defined not to allow the existence of a large number of obsolete data sectors and nor to implement background operations for functions such as garbage collection. Typically only two block containing obsolete sectors is allowed to exist for each of the Data Write Pointer DWP 46 and System Write Pointer SWP 48, and block erasure is performed as a foreground operation during sector write sequences .
  • This method of management means that the logical capacity of the flash memory does not have to be reduced to allow for the existence of a large volume of obsolete data, the data integrity is significantly improved by the absence of background operations, which are susceptible to interruption by power-down initiated by the host; and the pauses in data write sequences are short because erase operations are required for only a single block at a time.
  • Erase sector commands sent from a host 12 are supported by marking the target sector as obsolete, and allowing its erasure to follow according to the Block Erasure algorithm.
  • the Cyclic Storage block sequencing algorithm determines the sequence in which blocks within the flash memory 20 are used for the writing of new or relocated data, and is therefore responsible for ensuring that no block experiences a number of write/erase cycles which exceeds the endurance limit specified for the Flash memory system 20 which is being used.
  • any previous version which exists in the memorys system is treated as obsolete data.
  • the block erase algorithm ensures that blocks which contain obsolete data sectors are erased immediately, to allow recovery of the capacity occupied by these sectors.
  • the physical memory capacity of the system 10 is therefore occupied by valid data for logical sectors written by the host, plus a small number of proprietary Cyclic Storage control data structures and a number of erased blocks. Immediately after initial formatting, of the flash memory 10 the capacity of the memory 10 consists almost entirely of erased blocks.
  • the device When the host 12 has written at least once to all sectors in its logical address space, the device is considered to be logically full and its physical capacity is occupied almost entirely by valid data sectors, with a small number of erased blocks maintained for correct device operation. An increased number of erased blocks will be created only if the host 12 executes commands to erase logical sectors .
  • Erased blocks which are allocated for use by one of the write pointers, or for storage of control data structures are taken from a pool of available erased blocks.
  • a block is never erased in response to a need to perform a write operation to that specific block, the block sequencing algorithm determines the order of allocation for data write operations ' of blocks in the erased pool .
  • the next available block according to the algorithm is allocated, independent of whether the requirement is, for use by one of the write pointers or for a control data structure.
  • the data write algorithm provides the capability for tracking the sequence of sector writing using the logical addresses in the headers of sectors in sequential physical positions. This feature provides total data security even when the logical to physical address mapping records for recently written sectors are temporarily held in volatile controller memory SRAM 30 and not in Flash memory. Such temporary records can be reconstructed from the data sectors in Flash memory ' 20 when a system 10 in which the Cyclic Storage algorithms are implemented is initialised. It is therefore possible for the sector address table in Flash memory 20 to be updated on an infrequent basis, leading to a low percentage of overhead write operations for control data and a high sustained data write rate.
  • Figure 5 there is shown a schematic representation of the address translation process which uses a three level hierarchy of mapping structures 50 which is performed in the memory system 10.
  • the three levels of the hierarchy are the sector address table 52, the temporary sector address table 54 and the sector address record 56.
  • the top level of the hierarchy of the mapping structures is the sector address table 52, which is a master table containing a physical address for every logical sector stored in the system 10 and which is stored in Flash memory 20. Structures in the two lower levels of the hierarchy 54 and 56 provide the means for reducing the frequency at which write operations must occur to the sector address table.
  • the sector address record 56 is a list stored in the controller' s volatile memory SRAM 30 of logically contiguous sectors which have been written to system 10. This list allows the physical address of any logical sector which it contains to be determined without need for access to Flash memory 20. It may also be reconstructed during device initialisation from the sequence of recently-written sectors which may be traced n the Flash memory 20.
  • the intermediate temporary sector address table 54 is contained in Flash memory 20 and is updated with the contents of the sector address record 56 when the list becomes full.
  • the intermediate temporary sector address table 54 is in the same format as the sector address table 52, and allows physical address data updates to specific blocks of the sector address table 52 to be accumulated to allow a more efficient table write process to be performed.
  • the temporary table 54 allows the physical address of any logical sector contained in it to be determined without need for access to the sector address table 52.
  • mapping structures 50 is maintained with an infrequent requirement for write operations to Flash memory and efficiently supports logical to physical address translation in such a way which provides total security of sector address information is provided, even if electrical power is unpredictably removed from the system 10.
  • the data structures required to support the Cyclic Storage media management algorithms are stored principally in Flash memory 10 together with the host data sectors, with only a very limited amount of control data being held temporarily in the control processor' s volatile RAM 30. Information held in .the volatile memory 30 is non-critical, and can be reconstructed from Flash memory 10 if the power supply is interrupted.
  • Flash memory 20 All host data and control data structures in Flash memory 20 are written and read as physical sectors with identical logical format, comprising 512 bytes of information plus a 4-byte header defining sector type plus other type-dependent information, protected by 12 bytes of ECC .
  • physical sector has the meaning of a 528-byte data structure which is written by the controller to Flash memory.
  • the term does not denote a group of memory cell locations within Flash memory.
  • Physical sectors of similar type are grouped into dedicated blocks, where a block is a fundamental physical structure in Flash memory 20, in this case comprising sixteen physical sector locations, which can be erased in a single operation. Sectors of different types may not be located in the same block.
  • Cyclic storage media management algorithms operate on virtual blocks whee a virtual block is a group of one or more Flash blocks in Flash memory 20. Cyclic storage algorithms treat a virtual block as if it were a single Flash block.
  • Table 1 there is listed a selection of block types of flash system 10. The first of these is the data block 60 which contains host data sectors associated exclusively with a single write pointer (DWP 46, DRP 47, SWP 48 or SRP 49) wherein each physical data sector contains information originally written by the host system.
  • DWP 46, DRP 47, SWP 48 or SRP 49 write pointer
  • the Sector Address Table 52 is a list of address"ing Flash memory of physical sectors corresponding to all sectors in the system 10, which is spread over multiple •SAT blocks 62.
  • the SAT 52 contains one entry for each sector, ordered sequentially according to logical address .
  • the nth entry in the SAT 52 contains the physical address for the sector having logical address n.
  • a SAT block 62 contains entries for a logically contiguous set of sectors in a region of logical address space .
  • Each SAT block 62 is divided into two equal partitions, one dedicated to SAT entries and the other to temporary SAT (TSAT) entries.
  • the TSAT partition of the block is an area in which TSAT sectors., which are written during a control write operation, are temporarily stored before being written in the SAT partition of the block
  • TSAT sector When a TSAT sector is written, it is located at the first available sector position in the TSAT partition of the SAT block 62 to which the sector relates. A SAT block 62 is rewritten when its TSAT partition is full. Valid TSAT sectors in the previous TSAT partition replace the corresponding SAT sectors m the SAT partition, and the TSAT partition is left empty.
  • Each SAT sector contains SAT entries for a logically contiguous set of sectors and comprises 128 entries of 3 bytes each.
  • Each TSAT sector is a sector in the TSAT partition of a SAT block 62 and has an identical format to a SAT sector.
  • the TSAT sector contains SAT entries for a logically contiguous set of sectors and comprises 128 entries of 3 bytes each-
  • the TSATI of each TSAT contains an index tc the addresses of all valid TSAT sectors in the SAT block 62 in which it is located.
  • a TSATI is written in each TSAT sector during each TSAT write operation however, only the most recently written TSATI in a SAT block is valid.
  • the Map block 64 contains Map sectors which define the erased blocks in the system 10, and Erased Block Management (EBM) sectors, in this case. Only the last written EBM sector is valid.
  • Map block 64 is a bitmap structure having one bit for each block in the system 10.
  • Each bit in the Map block 64 is set to logical "0" if the corresponding block is in the erased state. Bits corresponding to blocks present in the Allocation' Block
  • Map Block List or Erased Block List are always set to logical "1" in the Map block 64.
  • the Map block 64 for the system 10 is able to occupy more than one Map sector, depending on the size of the system 10. In this case, each Map sector records the erase status of 4096 blocks within a specific physical address range.
  • 646 is subdivided into 16 zones, and flags are maintained to indicate the presence of erased blocks in each zone.
  • any block which , does not contain valid data structures and which is not included within a Map sector, the Allocation Block List or the Erased Block List is never used by the block allocation algorithm and is therefore inaccessible for storage of host or control data structures. This provides a simple mechanism for excluding blocks with defective locations from the accessible Flash memory address space.
  • the Map Zone Flag (MZF) field of the Map Block 64 is a bitmap defining the presence of erased blocks in each zone of a Map sector bitmap and is located in the header of the Map sector to which it corresponds.
  • the Erased Block Management (EBM) sector of the Map Block 64 contains information fields which are required for management of erased blocks. Only the last written EBM sector in the Map block is valid.
  • the Erased Block List (EBL) field of the EBM sector is a list of erased block addresses which defines which blocks are available for allocation for use.
  • the EBL field is a cyclic list within a fixed region of the EBM sector 64a and its bounds are defined by the EBL start (EBLS) and EBL length (EBLL) fields of the EBM sector.
  • the EBLS field is a pointer which defines the address, within the EBM sector, of the first entry of the EBL.
  • the EBLL field defines the length of the EBL.
  • the Erased Block Count (EBC) field defines the total number of erased blocks in the memory system 10 at the time the EBM sector is written.
  • the Map Count field of the map block 64 defines the number of erased blocks identified in each Map sector.
  • the Map Index field contains an index to the addresses of all valid Map sectors in the Map block 64. In this arrangement the current MAP Index is written with each EBM sector.
  • the Map Exchange Source Pointer (MSP) is a pointer to a Map sector to be used as the source sector in the next Map Exchange operation.
  • the Map Exchange Destination Pointer (MDP) field is a pointer to a Map sector to be used as the destination sector in the next Map Exchange operation.
  • Each Current Obsolete Blocks (COB) data structure (DCOB1, DCOB2, SCOB1, SCOB2) in the COB field of the Map Block defines the address of one of four blocks which are permitted to contain obsolete Data Sectors, together with a bitmap for the Map block identifying the obsolete sectors within it.
  • a maximum of two blocks may contain obsolete sectors created by write operations at the DWP 46, and two by write operations at the SWP 48. Obsolete sectors are never created by write operations at relocation pointers.
  • the COB data structures in the EBM sector are a copy of the COBs in SRAM 30.
  • the Write Pointers field of the Map Block EBM sector contains the physical addresses corresponding to of each of the DWP, DRP, SWP, and SRP write pointers immediately after the last record termination for that write pointer.
  • the Write Pointer field also contains the block links for each write pointer DWP, DRP, SWP and SRP since its last record termination. This information is necessary to allow the DWSL, SWSL, ABL, CBL and COB data structures to be reconstructed in SRAM 30 during the initialisation of memory system 10.
  • the last TSAT field defines the full physical address of the last written TSAT sector.
  • the SATA Address field defines the address of the SATA block within the memory 20.
  • the Sector Address Table Address Index (SATAI) field is an index to the addresses of all valid SATA sectors in the SATA block.
  • the SAT address (SATA) Block 66 contains SATA sectors which define the addresses of all SAT blocks within memory 20.
  • the SATA Sector 66a contains the physical addresses of the blocks of memory 20 containing the SAT 52. On a high capacity device, there may be more than one valid SATA sector 66a, each relating to a logically contiguous range of SAT blocks 62. The range is indicated in the SATA sector header. Only the last occurrence of a SATA sector for a given range is valid.
  • the Map Address (MA) Block 68 contains map address sectors with the MA Sector containing the address of each of the Map blocks 64.
  • the Bad Block List (BBL) Block 70 contains BBL sectors 70a wherein the Bad Block List (BBL) Sector 70a is a bitmap of all virtual blocks in Flash memory 20, identifying any which contain defective locations and which are therefore unusable. This information is used only by an external formatter program when the device is being reformatted. The BBL is updated if a block failure occurs during the operating life of the system 10.
  • the Boot Block (BB) 72 is a special block containing a unique identification code in the header of its first sector, which is located within the memory 20 by the controller 16 by a scanning process during the initialisation of the system 10.
  • the Boot Block 72 contains necessary information about the system configuration, and pointers to the Map Address block 68 within Flash memory 20, to allow system initialisation. It also contains information which is returned to a host device 12 in response ' to .'interrogation within the host interface protocols. Information is contained in different sector types in the Boot Block 72, wherein only the last occurrence of a specific sector type is valid. Two identical copies of the Boot Block 72 are set up for security, close to the top of physical block address space, however only one of the copies is updated with revised Map Address pointers.
  • the Boot Block Parameters (BBP) Sector 72b of the Boot Block 72 is a list of fixed parameters defining the device configuration.
  • the Information Structure Sector of the Boot Block 72 contains information which is loaded to a volatile memory, within the controller 16, for access by a host system 12. This may be the Card Information Structure (CIS) within PC Card or CompactFlash protocols.
  • CIS Card Information Structure
  • This command may be the Identify Drive command within the ATA protocol .
  • the MA Address (MAA) Sector 72a of the Boot Block 72 contains the physical address of the MA block ' 68 which must be located during the device initialisation and boot process. If the MA block' 68 is relocated a new copy of the MAA sector 72a is written.
  • the Firmware Block 67 contains Firmware sectors with each Firmware sector containing a firmware code page. Multiple Firmware blocks may exist at the lowest non defective virtual block addresses in Flash memory 20.
  • the processor 24 of the controller 16 is equipped with a volatile R/AM and in Table 2 there is shown the data structures which exist within the processor's volatile RAM.
  • the Data Write Sector List (DWSL) and Data Relocation Sector List (DRSL) are lists of sectors which have been written at the DWP and DRP write pointers which allow the virtual address to be calculated for any sector contained within them.
  • the DWSL and DRSL can be reconstructed from the data structures in Flash memory 20 during system initialisation.
  • Each of the DWSL and the DRSL comprises a single record and these are records of logically contiguous data sectors which have been written.
  • Each record contains the following fields:
  • LBA Logical address of the first sector in the record
  • Block Address List of virtual block addresses which store the sectors of the record.
  • the Record Length field is incremented by one and as an associated write pointer moves to a new allocated block, the block address is added to the Block Addresses field.
  • a DWSL or DRSL record is terminated upon any of the following conditions.
  • a sector to be written is logically non-contiguous
  • the logical address of a sector to be written is such that SAT entries for sectors in the record would be contained in more than 4 SAT sectors. This ensures that, for long sequences of contiguous sector writes, the last sector of a record corresponds to the last entry in a SAT page. This minimises the number of TSAT sector write operations .
  • the logical address of a sector to be written corresponds to a different SAT block from the other sectors in the record. This ensures that only a single SAT block write can be required during a control write operation.
  • DWSL record is already present in the DRSL record, or vice versa.
  • the DWSL and DRSL records are normally terminated together, and termination of records triggers a control write operation, which operates on sectors in both records after which the DWSL and DRSL records are then cleared .
  • SWSL System Write Sector List
  • SRSL System Relocation Sector List
  • SWSL and SRSL are lists of sectors which have been written at the SWP and SRP write pointers which allow the virtual address of what to be calculated for any sector contained within them.
  • the DWSL and the SRSL can be reconstructed from the data structures in Flash memory 20 during system initialisation.
  • Each of the SWSL and SRSL comprises a series of records, typically 4, associated with the appropriate write pointer, and each of these records is a record of logically contiguous data sectors which have been written, and they have the same format as records for DWSL and DRSL.
  • Each record contains the following fields.
  • LBA Logical address of the first sector in the record
  • Block Addresses List of virtual block addresses which store the sectors of the record.
  • the Record Length field is incremented by one.
  • An SWSL or SRSL record is frozen and a new one
  • a sector to be written is logically non-contiguous with the previous sector written at the same write pointer.
  • SWSL record is already present in the SRSL record, or vice versa.
  • a control write operation acts concurrently on all records in the SWSL and SRSL after which the terminated records are then cleared.
  • Each COB data structure (DCOB1, DCOB2, SCOB1, SCOB2) defines the address of one of four blocks which are permitted to contain obsolete Data Sectors, together with a bitmap for the block identifying the obsolete sectors within it .
  • a maximum of two blocks may contain obsolete sectors created by write operations at the DWP write
  • the COB data structures in 3RAM 30 are copied to the EBM sector whenever the EBM sector is written.
  • the Write Pointers field contains the virtual addresses corresponding to of each of the DWP, DRP, SWP, and SRP write pointers.
  • the Allocation Block List is a list of addresses of erased blocks currently available for assignment to a write pointer, or for rewriting a control structure.
  • the ABL does not contain a record of all erased blocks in the device. In this system, for example, the ABL may have capacity for up to sixteen blocks .
  • the sequence of allocation of blocks from the ABL corresponds to their order within the ABL.
  • the ABL can be reconstructed from the data structures in Flash memory 20 during system initialisation.
  • the Cleared Block List (CBL) is a list of addresses
  • the CBL may have capacity for up to 16 blocks.
  • the order of blocks within the CBL corresponds to the order in which they were erased.
  • the block erasure rate and rate of inclusion in the CBL need not match the block allocation rate from the ABL.
  • the CBL can be reconstructed from the data structures in Flash memory 20 during system initialisatio .
  • the SAT Cache of the processor RAM is a temporary record of the next group of entries in the SAT following the last entry for a data sector which was read from a SAT sector or a TSAT sector in Flash memory. It may contain, for example, 16 entries. Its purpose is to reduce the requirements for Flash memory access during the address translation operation.
  • the SAT Cache is not filled when an entry for a system sector is read from a TSAT or SAT sector.
  • Data structure locations in Flash memory 20 are defined by entries and fields within other data structures and a schematic representation of these are shown in the reference tree of Figure 6 which illustrates the data blocks corresponding to those detailed with reference to Table 1.
  • the Boot Block 72 can be identified during system
  • Flash memory 20 is required within this sequence, which is a significant factor contributing to high data write performance.
  • control structures in Flash memory 20 have to be modified, a control write operation is performed.
  • the Address Translate operation 76 implements a logical to physical address translation and is performed before every sector write operation to establish the existing physical location of the logical sector which is about to be written, or to locate the sector for a read operation. In all cases where a valid version of the sector exists in Flash memory 20, the target logical address may optionally be verified in the header of the sector by a sector read operation. Address translation is separately described in full.
  • the Block Assign operation occurs when a sector write operation causes one of the write pointers to jump to a new block, or a new block must be made available for a control structure.
  • the operation 78 allows the new block to be assigned by using the top entry on the Allocation Block List (ABL) . Only two blocks with obsolete sector data are permitted to be associated with each of the DWP and SWP write pointers.
  • ABL Allocation Block List
  • Only two blocks with obsolete sector data are permitted to be associated with each of the DWP and SWP write pointers.
  • a COB change operation 77 is performed to assign this third block as one of the two permitted COB blocks, and to perform a block erase operation on the one of the two current COB blocks.
  • the COB block selected to be changed is generally the block with the lesser number of valid sectors which must be relocated, but may also be the older of the two COB blocks. If the selected COB block contains a write pointer, the other COB block is alternatively selected for the block erase operation.
  • the appropriate COB data structure in processor RAM is updated.
  • a data block erase operation 79 causes a single block in physical memory of the Flash memory 20 to be erased.
  • COB data structures in processor RAM are used to determine if the block contains any valid data sectors which must first be relocated. Sectors are relocated by writing them at the DRP or SRP pointers, as appropriate.
  • the ABL is modified to remove the address of an erased block which has been allocated for use. If the ABL becomes empty, a control write operation 84 is triggered.
  • CBL Update operation 81 the CBL is modified to add the address of a block which has been erased during operation of the device. If the CBL becomes full, a control write operation 84 is triggered.
  • Figure 8 there is shown, in more detail, the address translation operation 76 in more detail and in particular the flow of operations which must take place to perform the sector address translation function.
  • a sector is identified as relating either to user data or system data, and a Write Sector List (WSL) search 86 is made of records in either the DWSL and DRSL, or SWSL and SRSL, as appropriate.
  • WSL Write Sector List
  • a record search requires a check to be made for the target address lying within the address range for the record determined by the record start address and the record length.
  • a SAT cache search operation 87 is performed only for data sectors. It requires a check to be made for the target address lying within the address range for the SAT cache determined by the cache start address and the cache length of 16 sectors. For operations on a logically contiguous file, 15 out of 16 sectors will result in a SAT cache hit. When a miss occurs, the cache is refilled with the following 16 sector addresses when the TSAT or SAT page is subsequently read.
  • a TSATI read operation 89 requires the TSATI field to be read from the most recently written TSAT sector in the target SAT block, and a search made in its index entries for the target SAT sector address.
  • a TSATI read and search may only be nec'essary after a SAT cache search 87 miss, which is for 1 in 16 sectors for a sequential file.
  • the processor keeps in processor RAM the logical address of the last SAT sector 62c accessed, and the physical location of the corresponding TSAT sector 62a or SAT sector 62c, and if this ' corresponds with the target SAT sector,, a TSATI search is unnecessary. Therefore, a TSATI read is required only once per 128 sectors for a sequential file, since a SAT sector has addresses for 128 data sectors.
  • the SAT read / SAT cache fill operation 91 and TSAT read / SAT cache fill operation 90 are identical, and require a SAT sector 62c or TSAT sector 62a or 62b to be read, and sixteen SAT entries to be loaded into the SAT cache in processor RAM.
  • the processor keeps within the processor RAM, the address of the last accessed SAT block. Therefore, it is only necessary to read a SATA sector 66a or an EBM sector 64a to determine the physical address of a SAT block 62 when the SAT block 62 has changed from the one used during the previous address translation operation.
  • the physical address calculation 88 is performed when a target sector address is identified as lying within a sector list record and the calculation 92 allows, its position relative to the start logical address to be determined and its virtual address calculated from the sector address and block address fields of the record.
  • the Typical operations flows for address translation for Data sectors which are logically sequential are as follows : 15 in each 16 sectors for the Sector list search operation 86 followed by the SAT cache search operation 87;
  • the operation flows for address translation for System sectors in a typical case is the Sector list search operation 86 followed by the Physical address calculation operation 88 upon identification of a target sector address within a sector list record.
  • the flow is Sector list search operation 86 followed by TSATI read operation 89 and TSAT or SAT read / SAT cache fill operation 90/91.
  • the Control Write Operation 84 implements a control write operation which updates control data structures in Flash memory 20 .
  • the flow of operations involvedin the control write operation 84 is illustrated in Figure 9.
  • Each of the operations which make up a control write have two components.
  • the first component relates to data structures which enable logical to physical address mapping for data sectors supplied by a host system 12, and the second component relates to data structures which manage erased blocks within the Flash memory 20 and their scheduling for use in writing data or control structures .
  • the sector list release operation 94 is performed on the DWSL and DRSL together, or the SWSL and SRSL together, if the current control write operation was triggered by termination of a record in a sector list. If the control write operation was triggered by a CBL or ABL update operation, all sector lists are terminated.
  • a sector list release causes all required information relating to sectors and blocks contained within the list to be transferred to data structures in Flash memory 20, and the sector list data structure in the processor's volatile RAM to be cleared.
  • the TSAT write operation 96 is performed during a sector list release to store in Flash memory 20 the virtual addresses for sectors within the records in the DWSL and DRSL or within records in the SWSL and SRSL.
  • a TSAT sector 62a or 62b is written, it is located at the first available sector position in the TSAT partition of the SAT block to which the sector relates. If the TSAT partition is full, a SAT block write operation must be performed.
  • the SAT write operation 98 requires one or more sectors of a single SAT block 62 to be modified to incorporate new entries for all sectors referenced by valid TSAT sectors 62c within with the SAT block 62. It is performed when the TSAT partition within a SAT block becomes filled. All sectors of the SAT block are rewritten with or without modification to a newly assigned SAT block. The previous location of the SAT block is erased and a modified SATA sector written.
  • the SATA write operation 100 requires an updated SATA sector 66a to be written to record a changed address for a SAT block 62.
  • the EBM sector 64a is written with updated SATA Index information.
  • SATA sector 66a When a SATA sector 66a must be written and no erased sector exists in the SATA block 66 , a block assign operation is performed and the SATA' sector written to its first sector by SATA blodk more operation 102.
  • the EBM sector 64a is written with updated SATA Address and SATA Index information. The previous location of the SATA Block 66 is erased, and its address added to the CBL.
  • the EBM sector write operation 95 updates erased block management data structures in Flash memory 20 and the ABL and CBL in processor RAM.
  • Map block 64 When the Map block 64 is filled, all valid Map sectors as identified in the Map index in the EBM sector are rewritten to a new assigned block, together with an EBM sector by Map Block Move operation 97. The previous location of the Map block 64 is erased and a modified MA sector 68a written.
  • the MA Write operation 99 ensures this modified MA sector 68a is written when the new Map block is written.
  • a boot block rewrite operation 104 is performed.
  • a second copy of the boot block exists and contains only the BBP, Information Structure and Identification sectors.
  • the current MAA. sector 72a is written to this second boot block copy, and the first boot block copy is erased.
  • the BBP, Information Structure and Identification sectors are then written back from the second copy to the first copy.
  • the second copy then becomes the active copy, and the first copy is held as a security copy. Subsequent MAA sectors are only written to the second copy.
  • the flow diagram shown in Figure 10 defines the block sequencing algorithm 115 for erased block allocation for use in writing data or control structures. If the memory system 10 is not full, that is there are erased blocks marked in bitmaps in one or more Map sectors 64b, the block addresses added to the end of the Erased Block List data structure, which solely defines blocks for allocation and use, relate to a combination of blocks from Map sectors ' and blocks from the CBL which have recently been erased. If the memory system is full, that is there are no erased blocks marked in Map sectors, the block addresses added to the end of the Erased Block List only relate to blocks from the EBL which have recently been erased. In this case, erased blocks are reused in exactly the order they became erased.
  • the EBL Prior to a Map write operation, the EBL is defined in the EBM sector 64a by the EBLS and EBLL pointers.
  • the first 16 entries in the EBL are addresses of blocks contained in the ABL in SRAM 30 immediately after the previous Map write operation. Addresses in the ABL in SRAM 30 may relate to blocks which have been allocated for use since the previous Map write operation, or to erased blocks which are available for allocation.
  • the ABL and CBL may both be full, partially filled, or empty at the start of a Map write operation. A schematic representation of this operation is shown in Figure 11.
  • the Map Source Sector Select operation 105 selects a source sector in the Map for reading erased block addresses by searching forwards from the position of the MSP pointer as it was at the completion of the previous Map write operation.
  • the MSP behaves as a cyclic pointer advancing through physical address space. If no erased blocks are indicated in any Map sector, as determined from the Map Count parameter, exchange operations with Map sectors are omitted.
  • the Map Destination Sector Select operation 106 finds a destination sector in the Map for writing erased block addresses by inspecting the block addresses in the CBL. Only one destination sector is selected.
  • the CBL2Map operation 107 ensures any block addresses in the CBL which relate to the selected Map destination sector are removed, and the corresponding bits in the Map destination sector are set to the erased state .
  • the Map sector is rewritten to Flash, unless the same sector is also the Map source sector.
  • the CBL need not be emptied by this operation 107, and may contain residual cleared blocks which could not be written to the Map destination sector.
  • the state of the data structures following this operation is shown in Figure 12.
  • the ABL and CBL Compaction 108 ensures the CBL is compacted by shifting the entries for residual cleared blocks to the beginning of the CBL and that the ABL is compacted by removing entries for allocated blocks which are associated with the sector list release being performed during the same control write operation, and shifting remaining entries to the beginning of the ABL.
  • the state of the data structures following this operation is shown in Fig. 13.
  • the Map2CBL operation 110 ensures block addresses corresponding to bits in -the Map source sector between the MSP pointer and the end of the sector, which are in the erased state, are written to the CBL and the bits in the Map source sector are changed to the unerased state. During this operation as many blocks as possible are written, filling the CBL if possible with the CBL being used as a write buffer in this operation.
  • the Map sector is rewritten to Flash memory 20 and the MSP pointer is changed to point to the last block written in the CBL.
  • the state of the data structures following this operation is shown in Fig. 14.
  • the CBL2EBL operation 111 ensures the block addresses buffered in the CBL 117 are added to the end of the EBL, and the CBL is cleared.
  • the blocks added to the EBL are a combination of recycled blocks from the CBL which are residual blocks remaining after the CBL2Map operation, and blocks defined by the cyclic MSP pointer which were loaded during the Map2CBL operation 110.
  • the state of the data structures following this operation are shown in Figure 15.
  • the EBL2ABL operation 112 ensures the ABL is filled by writing as many block addresses as required from the head of the EBL 118, or from positions 118a in the EBL 118 immediately following .' any available blocks already in the ABL 116.
  • the addresses of unreleased allocated blocks at the head of the ABL are copied to the head of the EBL.
  • the EBLS pointer is updated to make the first block addresses in the ABL and EBL correspond, and the EBLL is modified.
  • the state of the data structures following this operation is shown in Figure 16.
  • the EBM Write 113 ensures all required fields in the EBM sector which is buffered in the controller 16 are updated, and the sector is written to the Map block 64.
  • a vital step in the initialisation of the system 10 after it is powered ⁇ p by a host 12 is the reconstruction of the data structures in SRAM 30 from those in Flash memory 20. All control data structures in Flash memory must be found, then the recently written host data structures must be scanned to reconstruct the SRAM 30 data structures.
  • Flash memory 20 The data structures in Flash memory 20 are reconstructed by the following process, which makes use of the reference tree for data structures shown in Figure 6.
  • the boot block 72 is found by scanning sectors from the lowest physical address in Flash memory 20.
  • the BBP sector 72b is always the first sector of the boot block 72, and contains a uniquely identifiable signature in its header which allows it to be identified. Only sectors which can be the first sector of blocks with the smallest supported blocksize need be read. Blocks at the lowest addresses in Flash memory 20 which may be defined as always storing firmware code need not be scanned. The scanning process to identify the boot block is very short, as the boot block is located at the first available block at the beginning of Flash memory, following any blocks for firmware storage.
  • the boot block 72 are found, read and verified.
  • the Map Address block 68 is found, as defined in the
  • MAA sector 72a and its valid MA sector 68a found and verified .
  • the Map block 64 is- fo ⁇ nd and verified, as defined in the MA sector 68a.
  • the valid EBM sector 64a within the Map block 64 is the valid EBM sector 64a within the Map block 64.
  • the ABL, write pointers, sector lists and COBs are the ABL, write pointers, sector lists and COBs.
  • the first 16 entries of the EBL in the EBM sector 64a are read to establish the ABL contents after the immediately preceding control write operation.
  • the Write Pointers field in the EBL sector 64a is
  • the first sectors in blocks in the reconstructed ABL are read in sequence, to identify blocks associated with the DWP from sector headers contained in the blocks. When such a block is identified, all its sectors are read, and building of the DWSL record, as in step 3, is completed.
  • Block* a ⁇ iat ⁇ d with the DWP, identified in step A is completed.
  • a set of power loss recovery functions can be employed to repair data structures if they are either corrupted or do not correspond to each other as a result of power loss during normal operation.
  • a system which incorporates a flash disk device may be physically partitioned in several ways, according to the system architecture, however, all systems generally conform to the structure described herein before.
  • the flash memory 20 is shown in figure 1 as being part of a memory system 10 , however, it may alternatively be on a removable card and may connect to a host system via a logical interface 14 which as before conforms to industry
  • the controller may be on a removable card in which case the controller is typically a single integrated circuit.
  • the Flash memory 10 my consist of one or more integrated circuits and the controller may be integrated on the same integrated circuit as the Flash memory.
  • the host and the flash system may be physically partitioned such that only the Flash memory is on a removable card, which has a physical interface to the host system.
  • a hierarchy of this arrangement is shown in figure 17.
  • An example of such a removable Flash memory card is SmartMedia.
  • the controller is located within the host system 11 and may take theo form of an integrated circuit, or of firmware which is executed by a processor within the host system.
  • the method of the present invention may be implemented in an embedded memory system which is not physically removable from a host system.
  • a host system may have the same ' partitioning as is used for a memory system on a removable card, with the controller being in the form of an integrated circuit and with a logical interface conforming to industry standard protocols.
  • the controller may also be- integrated with other functions within the host system.
  • each sector is identified by a LBA, however, it may also be identified by and address in the Cylinder/Head/Sector (CHS) format originally used with magnetic disk devices.
  • CHS Cylinder/Head/Sector
  • the controller hardware is dedicated architecture in a separate integrated circuit, however, elements of the controller hardware, such as the microprocessor, may be shared with other functions within the host system.
  • the cyclic storage management algorithm may be implemented in a microprocessor withing the host system or the process may be performed via a standard microprocessor input/output ports without any dedicated co troller hardware. If the controller is part of an embedded memory system and shares its microprocessor with other functions of a host system, the logical interface for the control of the memory system may be implemented directly withing firmware executed by the processor, this means that hardware registers may 'be .eliminated and ariables may be passed directly to a controller function which may be called by a host function within the firmware code.
  • a separate memory block could be used exclusively for buffering sector data.
  • this memory block could be a dual port RAM, with ports allocating independent access by the host interface control block and the flash interface control block.
  • the memory blocks into which the memory sectors were arranged were described as being a physical structure within the flas memory comprising 32 sector locations, however it is also possible that these memory blocks comprise 16 Sector locations.
  • the memory blocks an alternatively be virtual blocks comprising physical blocks distributed across multiple flash chips or multiple independent arrays within the same chip which are erased in a single operation by the controller. Where a virtual block comprises M physical blocks, each with capacity for N sectors, the virtual block has capacity for M*N sectors.
  • a virtual block is treated in exactly the same way as a physical block by the cyclic storage media management algorithms .
  • the present invention can be implemented by a computer program operating on a microprocessor.
  • An aspect of the present invention thus provides a storage medium storing processor implementable instructions for controlling a processor to carry out the method as hereinabove described.
  • SWSL System Write Sector List
  • SRSL System Relocation Sector List
  • ABL Allocation Block List

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
  • Read Only Memory (AREA)

Abstract

Dans un premier aspect, cette invention concerne un contrôleur connecté à une mémoire non volatile et comprenant une mémoire volatile. Ce contrôleur conserve en mémoire volatile des listes de blocs de la mémoire non volatile alloués au stockage de données de secteur logique et des listes de blocs récemment effacés dans la mémoire non volatile. .
PCT/GB2002/004381 2001-09-28 2002-09-27 Procede d'ecriture de donnees dans une memoire non volatile WO2003027828A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP02760436A EP1430386B1 (fr) 2001-09-28 2002-09-27 Procede d'ecriture de donnees dans une memoire non volatile
DE60217883T DE60217883T2 (de) 2001-09-28 2002-09-27 Verfahren zum schreiben von daten in einen nicht-flüchtigen speicher

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0123415.2 2001-09-28
GBGB0123415.2A GB0123415D0 (en) 2001-09-28 2001-09-28 Method of writing data to non-volatile memory

Publications (1)

Publication Number Publication Date
WO2003027828A1 true WO2003027828A1 (fr) 2003-04-03

Family

ID=9922930

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/004381 WO2003027828A1 (fr) 2001-09-28 2002-09-27 Procede d'ecriture de donnees dans une memoire non volatile

Country Status (6)

Country Link
US (4) US7340581B2 (fr)
EP (2) EP1430386B1 (fr)
AT (2) ATE408861T1 (fr)
DE (2) DE60217883T2 (fr)
GB (2) GB0123415D0 (fr)
WO (1) WO2003027828A1 (fr)

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005066972A1 (fr) 2003-12-30 2005-07-21 Sandisk Corporation Memoire non volatile et procede de systeme de gestion de blocs
DE102004063757A1 (de) * 2004-12-29 2006-07-13 Francotyp-Postalia Ag & Co. Kg Verfahren und Anordnung zum Manipulieren des Inhalts eines Datenspeichers
EP1758027A2 (fr) 2003-12-30 2007-02-28 SanDisk Corporation Mémoire non volatile et procédé avec gestion de données de commande
WO2007056106A2 (fr) * 2005-11-03 2007-05-18 Intel Corporation Récupération après panne d’une mémoire non volatile
US7315917B2 (en) 2005-01-20 2008-01-01 Sandisk Corporation Scheduling of housekeeping operations in flash memory systems
US7383375B2 (en) 2003-12-30 2008-06-03 Sandisk Corporation Data run programming
EP1934752A1 (fr) * 2005-10-07 2008-06-25 Microsoft Corporation Gestion de memoire flash
US7433993B2 (en) 2003-12-30 2008-10-07 San Disk Corportion Adaptive metablocks
US7509471B2 (en) 2005-10-27 2009-03-24 Sandisk Corporation Methods for adaptively handling data writes in non-volatile memories
US7631162B2 (en) 2005-10-27 2009-12-08 Sandisck Corporation Non-volatile memory with adaptive handling of data writes
WO2010078222A1 (fr) 2009-01-05 2010-07-08 Sandisk Corporation Mémoire non volatile et procédé avec partitionnement de cache d'écriture
WO2010078540A2 (fr) 2009-01-05 2010-07-08 Sandisk Corporation Gestion de blocs de réserve dans des mémoires non volatiles
US7774392B2 (en) 2006-09-15 2010-08-10 Sandisk Corporation Non-volatile memory with management of a pool of update memory blocks based on each block's activity and data order
US7779056B2 (en) 2006-09-15 2010-08-17 Sandisk Corporation Managing a pool of update memory blocks based on each block's activity and data order
WO2011075594A1 (fr) 2009-12-18 2011-06-23 Sandisk Corporation Mémoire non volatile à contrôle à vitesses multiples utilisant un pliage sur puce de données
WO2011075597A1 (fr) 2009-12-18 2011-06-23 Sandisk Corporation Flux de transfert de données destiné à un pliage sur puce
WO2011075572A1 (fr) 2009-12-18 2011-06-23 Sandisk Corporation Gestion de mises à jour d'une mémoire multi-niveaux non volatile dans une mémoire binaire non volatile
WO2011082005A1 (fr) * 2009-12-30 2011-07-07 Sandisk Corporation Micro-architecture de mise à jour pour tables d'adresses
WO2011162973A1 (fr) 2010-06-23 2011-12-29 Sandisk Technologies Inc. Utilisation de bandes de garde et d'opérations d'entretien par étapes pour éviter de dépasser des exigences de latence maximale dans systèmes de mémoire non volatile
US8094500B2 (en) 2009-01-05 2012-01-10 Sandisk Technologies Inc. Non-volatile memory and method with write cache partitioning
US8244960B2 (en) 2009-01-05 2012-08-14 Sandisk Technologies Inc. Non-volatile memory and method with write cache partition management methods
US8543757B2 (en) 2010-06-23 2013-09-24 Sandisk Technologies Inc. Techniques of maintaining logical to physical mapping information in non-volatile memory systems
US8700840B2 (en) 2009-01-05 2014-04-15 SanDisk Technologies, Inc. Nonvolatile memory with write cache having flush/eviction methods
US8897080B2 (en) 2012-09-28 2014-11-25 Sandisk Technologies Inc. Variable rate serial to parallel shift register
US9076506B2 (en) 2012-09-28 2015-07-07 Sandisk Technologies Inc. Variable rate parallel to serial shift register
US9342446B2 (en) 2011-03-29 2016-05-17 SanDisk Technologies, Inc. Non-volatile memory system allowing reverse eviction of data updates to non-volatile binary cache
US9490035B2 (en) 2012-09-28 2016-11-08 SanDisk Technologies, Inc. Centralized variable rate serializer and deserializer for bad column management
US9817593B1 (en) 2016-07-11 2017-11-14 Sandisk Technologies Llc Block management in non-volatile memory system with non-blocking control sync system
US10032524B2 (en) 2015-02-09 2018-07-24 Sandisk Technologies Llc Techniques for determining local interconnect defects
US10114562B2 (en) 2014-09-16 2018-10-30 Sandisk Technologies Llc Adaptive block allocation in nonvolatile memory
US11830546B2 (en) 2011-07-19 2023-11-28 Vervain, Llc Lifetime mixed level non-volatile memory system
US11967370B1 (en) 2023-12-20 2024-04-23 Vervain, Llc Lifetime mixed level non-volatile memory system

Families Citing this family (159)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6978342B1 (en) 1995-07-31 2005-12-20 Lexar Media, Inc. Moving sectors within a block of information in a flash memory mass storage architecture
US8171203B2 (en) 1995-07-31 2012-05-01 Micron Technology, Inc. Faster write operations to nonvolatile memory using FSInfo sector manipulation
US5845313A (en) 1995-07-31 1998-12-01 Lexar Direct logical block addressing flash memory mass storage architecture
US6728851B1 (en) 1995-07-31 2004-04-27 Lexar Media, Inc. Increasing the memory performance of flash memory devices by writing sectors simultaneously to multiple flash memory devices
US20050257827A1 (en) * 2000-04-27 2005-11-24 Russell Gaudiana Rotational photovoltaic cells, systems and methods
US7167944B1 (en) 2000-07-21 2007-01-23 Lexar Media, Inc. Block management for mass storage
US6760908B2 (en) * 2001-07-16 2004-07-06 Namodigit Corporation Embedded software update system
GB0123410D0 (en) 2001-09-28 2001-11-21 Memquest Ltd Memory system for data storage and retrieval
GB0123415D0 (en) 2001-09-28 2001-11-21 Memquest Ltd Method of writing data to non-volatile memory
GB0123421D0 (en) 2001-09-28 2001-11-21 Memquest Ltd Power management system
GB0123416D0 (en) 2001-09-28 2001-11-21 Memquest Ltd Non-volatile memory control
US7231643B1 (en) 2002-02-22 2007-06-12 Lexar Media, Inc. Image rescue system including direct communication between an application program and a device driver
US6901499B2 (en) * 2002-02-27 2005-05-31 Microsoft Corp. System and method for tracking data stored in a flash memory device
US7533214B2 (en) * 2002-02-27 2009-05-12 Microsoft Corporation Open architecture flash driver
US7085879B2 (en) * 2002-02-27 2006-08-01 Microsoft Corporation Dynamic data structures for tracking data stored in a flash memory device
US7093101B2 (en) * 2002-11-21 2006-08-15 Microsoft Corporation Dynamic data structures for tracking file system free space in a flash memory device
US20050050108A1 (en) * 2003-08-21 2005-03-03 Texas Instruments Incorporated File system for digital processing systems with limited resources
JP4404625B2 (ja) * 2003-12-25 2010-01-27 パナソニック株式会社 情報処理装置および該装置用のｒｏｍイメージ生成装置
US7725628B1 (en) 2004-04-20 2010-05-25 Lexar Media, Inc. Direct secondary device interface by a host
US7370166B1 (en) 2004-04-30 2008-05-06 Lexar Media, Inc. Secure portable storage device
US8082382B2 (en) * 2004-06-04 2011-12-20 Micron Technology, Inc. Memory device with user configurable density/performance
US7177782B2 (en) * 2004-06-18 2007-02-13 Lenovo (Singapore) Pte. Ltd. Methods and arrangements for capturing runtime information
US7594063B1 (en) 2004-08-27 2009-09-22 Lexar Media, Inc. Storage capacity status
US7464306B1 (en) 2004-08-27 2008-12-09 Lexar Media, Inc. Status of overall health of nonvolatile memory
JP2006085596A (ja) * 2004-09-17 2006-03-30 Mitsubishi Electric Corp 情報記録読出装置
US7849253B2 (en) * 2005-04-04 2010-12-07 Standard Microsystems Corporation Method for fast access to flash-memory media
US8521752B2 (en) * 2005-06-03 2013-08-27 Osr Open Systems Resources, Inc. Systems and methods for arbitrary data transformations
US7509474B2 (en) * 2005-06-08 2009-03-24 Micron Technology, Inc. Robust index storage for non-volatile memory
US8819088B2 (en) * 2005-07-14 2014-08-26 International Business Machines Corporation Implementing storage management functions using a data store system
US7631245B2 (en) * 2005-09-26 2009-12-08 Sandisk Il Ltd. NAND flash memory controller exporting a NAND interface
US8291295B2 (en) * 2005-09-26 2012-10-16 Sandisk Il Ltd. NAND flash memory controller exporting a NAND interface
KR101274181B1 (ko) * 2006-02-13 2013-06-14 삼성전자주식회사 플래시 메모리를 관리하는 장치 및 방법
JP4908026B2 (ja) * 2006-03-22 2012-04-04 株式会社東芝 情報処理装置
JP2008033412A (ja) * 2006-07-26 2008-02-14 Hitachi Ltd 計算機システムの性能管理方法、管理計算機、及びストレージ装置
US7711889B2 (en) 2006-07-31 2010-05-04 Kabushiki Kaisha Toshiba Nonvolatile memory system, and data read/write method for nonvolatile memory system
US7512748B1 (en) 2006-08-17 2009-03-31 Osr Open Systems Resources, Inc. Managing lock rankings
US8539228B1 (en) 2006-08-24 2013-09-17 Osr Open Systems Resources, Inc. Managing access to a resource
KR100843133B1 (ko) * 2006-09-20 2008-07-02 삼성전자주식회사 플래시 메모리에서 매핑 정보 재구성을 위한 장치 및 방법
KR100845137B1 (ko) * 2006-10-02 2008-07-09 삼성전자주식회사 메모리 장치의 배드 블록 주소를 번역하는 방법, 메모리장치의 배드 블록 주소를 번역하는 장치 및 이를 포함하는메모리 장치 컨트롤러
US8745315B2 (en) * 2006-11-06 2014-06-03 Rambus Inc. Memory Systems and methods supporting volatile and wear-leveled nonvolatile physical memory
US8935302B2 (en) 2006-12-06 2015-01-13 Intelligent Intellectual Property Holdings 2 Llc Apparatus, system, and method for data block usage information synchronization for a non-volatile storage volume
US9495241B2 (en) 2006-12-06 2016-11-15 Longitude Enterprise Flash S.A.R.L. Systems and methods for adaptive data storage
US9104599B2 (en) 2007-12-06 2015-08-11 Intelligent Intellectual Property Holdings 2 Llc Apparatus, system, and method for destaging cached data
US8489817B2 (en) 2007-12-06 2013-07-16 Fusion-Io, Inc. Apparatus, system, and method for caching data
US8706968B2 (en) 2007-12-06 2014-04-22 Fusion-Io, Inc. Apparatus, system, and method for redundant write caching
US9116823B2 (en) 2006-12-06 2015-08-25 Intelligent Intellectual Property Holdings 2 Llc Systems and methods for adaptive error-correction coding
US8402201B2 (en) 2006-12-06 2013-03-19 Fusion-Io, Inc. Apparatus, system, and method for storage space recovery in solid-state storage
US8443134B2 (en) 2006-12-06 2013-05-14 Fusion-Io, Inc. Apparatus, system, and method for graceful cache device degradation
KR100877609B1 (ko) * 2007-01-29 2009-01-09 삼성전자주식회사 버퍼 메모리의 플래그 셀 어레이를 이용하여 데이터 오류 정정을 수행하는 반도체 메모리 시스템 및 그 구동 방법
KR100869675B1 (ko) * 2007-02-05 2008-11-21 지인정보기술 주식회사 디스크립터 배열을 이용한 플래시 메모리 제어 시스템 및방법
WO2008106686A1 (fr) * 2007-03-01 2008-09-04 Douglas Dumitru Dispositif et méthodologie de bloc rapide
KR20080085574A (ko) * 2007-03-20 2008-09-24 삼성전자주식회사 비휘발성 메모리의 가비지 컬렉션을 위한 장치 및 방법
US8024433B2 (en) * 2007-04-24 2011-09-20 Osr Open Systems Resources, Inc. Managing application resources
US7991942B2 (en) 2007-05-09 2011-08-02 Stmicroelectronics S.R.L. Memory block compaction method, circuit, and system in storage devices based on flash memories
US7882301B2 (en) * 2007-05-09 2011-02-01 Stmicroelectronics S.R.L. Wear leveling in storage devices based on flash memories and related circuit, system, and method
US8041883B2 (en) * 2007-05-09 2011-10-18 Stmicroelectronics S.R.L. Restoring storage devices based on flash memories and related circuit, system, and method
US7949693B1 (en) 2007-08-23 2011-05-24 Osr Open Systems Resources, Inc. Log-structured host data storage
US8095851B2 (en) * 2007-09-06 2012-01-10 Siliconsystems, Inc. Storage subsystem capable of adjusting ECC settings based on monitored conditions
US7836226B2 (en) 2007-12-06 2010-11-16 Fusion-Io, Inc. Apparatus, system, and method for coordinating storage requests in a multi-processor/multi-thread environment
US9519540B2 (en) 2007-12-06 2016-12-13 Sandisk Technologies Llc Apparatus, system, and method for destaging cached data
US8073884B2 (en) * 2007-12-20 2011-12-06 Hewlett-Packard Development Company, L.P. System and method to derive high level file system information by passively monitoring low level operations on a FAT file system
EP2077559B1 (fr) * 2007-12-27 2012-11-07 Hagiwara Solutions Co., Ltd. Procédé de rafraîchissement d'une mémoire flash
TW200931425A (en) * 2008-01-11 2009-07-16 Phison Electronics Corp Method for managing flash memory blocks and controller using the same
US8195978B2 (en) 2008-05-16 2012-06-05 Fusion-IO. Inc. Apparatus, system, and method for detecting and replacing failed data storage
US8843691B2 (en) 2008-06-25 2014-09-23 Stec, Inc. Prioritized erasure of data blocks in a flash storage device
CN101645309B (zh) * 2008-08-05 2013-05-22 威刚科技（苏州）有限公司 非挥发性存储装置及其控制方法
US8438325B2 (en) * 2008-10-09 2013-05-07 Cadence Design Systems, Inc. Method and apparatus for improving small write performance in a non-volatile memory
WO2010043245A1 (fr) * 2008-10-13 2010-04-22 Hyperstone Gmbh Procédé de sauvegarde d’un bloc d’ancrage dans des mémoires flash
CN101526921B (zh) * 2008-12-31 2014-07-30 飞天诚信科技股份有限公司 写入数据的方法及装置
US20100185843A1 (en) * 2009-01-20 2010-07-22 Microsoft Corporation Hardware encrypting storage device with physically separable key storage device
US8312204B2 (en) * 2009-01-23 2012-11-13 Seagate Technology Llc System and method for wear leveling in a data storage device
US7944729B2 (en) * 2009-01-28 2011-05-17 Seagate Technology Llc Simultaneously writing multiple addressable blocks of user data to a resistive sense memory cell array
US9092649B2 (en) * 2009-03-02 2015-07-28 Macronix International Co., Ltd. Data protecting method capable of effectively recording protection information and memory using thereof
US8341501B2 (en) 2009-04-30 2012-12-25 International Business Machines Corporation Adaptive endurance coding of non-volatile memories
US8281227B2 (en) 2009-05-18 2012-10-02 Fusion-10, Inc. Apparatus, system, and method to increase data integrity in a redundant storage system
US8307258B2 (en) 2009-05-18 2012-11-06 Fusion-10, Inc Apparatus, system, and method for reconfiguring an array to operate with less storage elements
US9330282B2 (en) * 2009-06-10 2016-05-03 Microsoft Technology Licensing, Llc Instruction cards for storage devices
US8321956B2 (en) 2009-06-17 2012-11-27 Microsoft Corporation Remote access control of storage devices
US20110041005A1 (en) * 2009-08-11 2011-02-17 Selinger Robert D Controller and Method for Providing Read Status and Spare Block Management Information in a Flash Memory System
US20110041039A1 (en) * 2009-08-11 2011-02-17 Eliyahou Harari Controller and Method for Interfacing Between a Host Controller in a Host and a Flash Memory Device
US20110040924A1 (en) * 2009-08-11 2011-02-17 Selinger Robert D Controller and Method for Detecting a Transmission Error Over a NAND Interface Using Error Detection Code
CN102597910B (zh) * 2009-09-09 2015-03-25 弗森-艾奥公司 存储设备中用于功率减小管理的装置、系统及方法
US9223514B2 (en) 2009-09-09 2015-12-29 SanDisk Technologies, Inc. Erase suspend/resume for memory
US8972627B2 (en) 2009-09-09 2015-03-03 Fusion-Io, Inc. Apparatus, system, and method for managing operations for data storage media
US9021158B2 (en) 2009-09-09 2015-04-28 SanDisk Technologies, Inc. Program suspend/resume for memory
US8176234B2 (en) * 2009-12-04 2012-05-08 International Business Machines Corporation Multi-write coding of non-volatile memories
US8176235B2 (en) * 2009-12-04 2012-05-08 International Business Machines Corporation Non-volatile memories with enhanced write performance and endurance
US8489803B2 (en) * 2009-12-14 2013-07-16 Smsc Holdings S.A.R.L. Efficient use of flash memory in flash drives
US8417904B2 (en) * 2010-03-17 2013-04-09 Seagate Technology Llc Garbage collection management in a data storage device
KR20110119408A (ko) * 2010-04-27 2011-11-02 삼성전자주식회사 데이터 저장 장치 및 그것의 동작 방법
US8984216B2 (en) 2010-09-09 2015-03-17 Fusion-Io, Llc Apparatus, system, and method for managing lifetime of a storage device
US8769374B2 (en) 2010-10-13 2014-07-01 International Business Machines Corporation Multi-write endurance and error control coding of non-volatile memories
US9208071B2 (en) 2010-12-13 2015-12-08 SanDisk Technologies, Inc. Apparatus, system, and method for accessing memory
WO2012082792A2 (fr) 2010-12-13 2012-06-21 Fusion-Io, Inc. Appareil, système et procédé destinés à une mémoire à validation automatique
US10817421B2 (en) 2010-12-13 2020-10-27 Sandisk Technologies Llc Persistent data structures
US9218278B2 (en) 2010-12-13 2015-12-22 SanDisk Technologies, Inc. Auto-commit memory
US9047178B2 (en) 2010-12-13 2015-06-02 SanDisk Technologies, Inc. Auto-commit memory synchronization
US10817502B2 (en) 2010-12-13 2020-10-27 Sandisk Technologies Llc Persistent memory management
US20120239860A1 (en) 2010-12-17 2012-09-20 Fusion-Io, Inc. Apparatus, system, and method for persistent data management on a non-volatile storage media
US8966184B2 (en) 2011-01-31 2015-02-24 Intelligent Intellectual Property Holdings 2, LLC. Apparatus, system, and method for managing eviction of data
US9141527B2 (en) 2011-02-25 2015-09-22 Intelligent Intellectual Property Holdings 2 Llc Managing cache pools
US8621328B2 (en) 2011-03-04 2013-12-31 International Business Machines Corporation Wear-focusing of non-volatile memories for improved endurance
US8595426B2 (en) * 2011-04-11 2013-11-26 Sandisk Il Ltd. Handling commands within a write-once read-many storage device configuration
US20120303878A1 (en) * 2011-05-26 2012-11-29 International Business Machines Corporation Method and Controller for Identifying a Unit in a Solid State Memory Device for Writing Data to
CN102214145B (zh) * 2011-07-14 2013-07-17 李佰战 一种闪存数据更新方法及系统
US8527544B1 (en) * 2011-08-11 2013-09-03 Pure Storage Inc. Garbage collection in a storage system
US8707104B1 (en) 2011-09-06 2014-04-22 Western Digital Technologies, Inc. Systems and methods for error injection in data storage systems
US8700834B2 (en) 2011-09-06 2014-04-15 Western Digital Technologies, Inc. Systems and methods for an enhanced controller architecture in data storage systems
US8713357B1 (en) 2011-09-06 2014-04-29 Western Digital Technologies, Inc. Systems and methods for detailed error reporting in data storage systems
US9195530B1 (en) 2011-09-06 2015-11-24 Western Digital Technologies, Inc. Systems and methods for improved data management in data storage systems
US8903874B2 (en) 2011-11-03 2014-12-02 Osr Open Systems Resources, Inc. File system directory attribute correction
KR20130075018A (ko) * 2011-12-27 2013-07-05 한국전자통신연구원 플래시 메모리 파일 시스템에 적용 가능한 데이터 업데이트 장치 및 방법
US9767032B2 (en) 2012-01-12 2017-09-19 Sandisk Technologies Llc Systems and methods for cache endurance
US9251086B2 (en) 2012-01-24 2016-02-02 SanDisk Technologies, Inc. Apparatus, system, and method for managing a cache
US8868978B2 (en) 2012-02-14 2014-10-21 International Business Machines Corporation Reclaiming discarded solid state devices
US10019353B2 (en) 2012-03-02 2018-07-10 Longitude Enterprise Flash S.A.R.L. Systems and methods for referencing data on a storage medium
US9053008B1 (en) 2012-03-26 2015-06-09 Western Digital Technologies, Inc. Systems and methods for providing inline parameter service in data storage devices
US9846641B2 (en) 2012-06-18 2017-12-19 International Business Machines Corporation Variability aware wear leveling
US8938796B2 (en) * 2012-09-20 2015-01-20 Paul Case, SR. Case secure computer architecture
US10642505B1 (en) 2013-01-28 2020-05-05 Radian Memory Systems, Inc. Techniques for data migration based on per-data metrics and memory degradation
US9652376B2 (en) 2013-01-28 2017-05-16 Radian Memory Systems, Inc. Cooperative flash memory control
US10445229B1 (en) 2013-01-28 2019-10-15 Radian Memory Systems, Inc. Memory controller with at least one address segment defined for which data is striped across flash memory dies, with a common address offset being used to obtain physical addresses for the data in each of the dies
US9026720B2 (en) 2013-02-07 2015-05-05 Apple Inc. Non-volatile memory monitoring
KR102106959B1 (ko) * 2013-02-21 2020-05-07 에프아이오 세미컨덕터 테크놀로지스, 엘엘씨 멀티 레벨 셀 비휘발성 메모리 시스템
US8812744B1 (en) 2013-03-14 2014-08-19 Microsoft Corporation Assigning priorities to data for hybrid drives
US9626126B2 (en) 2013-04-24 2017-04-18 Microsoft Technology Licensing, Llc Power saving mode hybrid drive access management
US9946495B2 (en) 2013-04-25 2018-04-17 Microsoft Technology Licensing, Llc Dirty data management for hybrid drives
US9256371B2 (en) 2013-05-28 2016-02-09 Globalfoundries Inc. Implementing reinforcement learning based flash control
US10019352B2 (en) 2013-10-18 2018-07-10 Sandisk Technologies Llc Systems and methods for adaptive reserve storage
KR102252419B1 (ko) * 2014-01-09 2021-05-14 한국전자통신연구원 플래시 메모리 장치를 위한 주소변환 시스템 및 그 방법
US9830329B2 (en) 2014-01-15 2017-11-28 W. Anthony Mason Methods and systems for data storage
US9666244B2 (en) 2014-03-01 2017-05-30 Fusion-Io, Inc. Dividing a storage procedure
US11537290B2 (en) 2014-03-20 2022-12-27 International Business Machines Corporation Managing high performance storage systems with hybrid storage technologies
TWI522804B (zh) * 2014-04-23 2016-02-21 威盛電子股份有限公司 快閃記憶體控制器以及資料儲存裝置以及快閃記憶體控制方法
TWI502345B (zh) * 2014-05-12 2015-10-01 Via Tech Inc 快閃記憶體控制晶片以及資料儲存裝置以及快閃記憶體控制方法
US20160062911A1 (en) * 2014-08-27 2016-03-03 Advanced Micro Devices, Inc. Routing direct memory access requests in a virtualized computing environment
US9423961B2 (en) * 2014-09-08 2016-08-23 Apple Inc. Method to enhance programming performance in multilevel NVM devices
US10552085B1 (en) * 2014-09-09 2020-02-04 Radian Memory Systems, Inc. Techniques for directed data migration
US9542118B1 (en) 2014-09-09 2017-01-10 Radian Memory Systems, Inc. Expositive flash memory control
US9418699B1 (en) * 2014-10-09 2016-08-16 Western Digital Technologies, Inc. Management of sequentially written data
US9933950B2 (en) 2015-01-16 2018-04-03 Sandisk Technologies Llc Storage operation interrupt
US10552058B1 (en) 2015-07-17 2020-02-04 Radian Memory Systems, Inc. Techniques for delegating data processing to a cooperative memory controller
CN108431784B (zh) 2015-12-30 2020-12-04 华为技术有限公司 访问请求处理方法、装置及计算机系统
CN108431783B (zh) 2015-12-30 2020-09-18 华为技术有限公司 访问请求处理方法、装置及计算机系统
US20180239532A1 (en) * 2017-02-23 2018-08-23 Western Digital Technologies, Inc. Techniques for performing a non-blocking control sync operation
GB2563473B (en) * 2017-06-15 2019-10-02 Accelercomm Ltd Polar coder with logical three-dimensional memory, communication unit, integrated circuit and method therefor
US10970204B2 (en) * 2017-08-29 2021-04-06 Samsung Electronics Co., Ltd. Reducing read-write interference by adaptive scheduling in NAND flash SSDs
US11221958B2 (en) 2017-08-29 2022-01-11 Samsung Electronics Co., Ltd. System and method for LBA-based RAID
CN108073363B (zh) * 2017-12-28 2021-10-01 深圳市得一微电子有限责任公司 数据存储方法、存储设备及计算机可读存储介质
US10410732B1 (en) 2018-05-21 2019-09-10 Western Digital Technologies, Inc. Failure prediction by cell probing
KR102605205B1 (ko) * 2018-07-25 2023-11-24 에스케이하이닉스 주식회사 메모리 장치 및 프로세싱 시스템
US10679708B2 (en) * 2018-09-17 2020-06-09 Western Digital Technologies, Inc. Pre-program read to counter wordline failures
US11442867B2 (en) 2018-12-20 2022-09-13 Micron Technology, Inc. Using a second content-addressable memory to manage memory burst accesses in memory sub-systems
US11132303B2 (en) * 2020-02-04 2021-09-28 Micron Technology, Inc. Memory sub-system management of firmware block record and device block record
US11500769B2 (en) * 2020-12-21 2022-11-15 Micron Technology, Inc. Valid data identification for garbage collection
CN112711378B (zh) * 2020-12-22 2022-08-05 四川九洲电器集团有限责任公司 数据储存方法及读写设备
WO2023287407A1 (fr) * 2021-07-14 2023-01-19 Hewlett-Packard Development Company, L.P. Initialisation de composant matériel
US11816349B2 (en) 2021-11-03 2023-11-14 Western Digital Technologies, Inc. Reduce command latency using block pre-erase
JP2023112368A (ja) * 2022-02-01 2023-08-14 キオクシア株式会社 メモリシステム

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522780A2 (fr) * 1991-07-12 1993-01-13 International Business Machines Corporation Procédé de commande pour un dispositif mémoire d'ordinateur
US6275436B1 (en) * 1993-04-08 2001-08-14 Hitachi, Ltd Flash memory control method and apparatus processing system therewith

Family Cites Families (298)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US596473A (en) * 1898-01-04 Theodore brand
US540117A (en) * 1895-05-28 Conductor-distributing frame
US697666A (en) * 1901-02-09 1902-04-15 Frederick Sargent Condenser.
US691008A (en) * 1901-04-25 1902-01-14 William E Schilling Device for operating street-railway switches.
US722585A (en) * 1902-12-06 1903-03-10 Robert W Jemison Bookkeepers's stool.
US852766A (en) * 1904-07-21 1907-05-07 Rudolf Brebach Automatic electrical cut-out device.
US852765A (en) * 1905-10-05 1907-05-07 Arthur L Brannock Grain-drier.
US910826A (en) * 1908-03-27 1909-01-26 William A Kirkpatrick Dispensing-container.
CH236066A (de) * 1940-04-18 1945-01-15 Mueller & Cie Maschinenfabrik Leimauftragvorrichtung an einer Leimmaschine.
US2822245A (en) * 1954-11-26 1958-02-04 Kimberly Clark Co Process for manufacturing sulfur dioxide by burning sulfur
CH325501A (de) * 1954-11-26 1957-11-15 Ruf Walter Minenwerfer
US3034897A (en) * 1960-12-09 1962-05-15 Eastman Kodak Co Method for preparing bakery products using mixed partial ester compositions
CA1030686A (fr) 1973-06-20 1978-05-02 James R. Gross Articles absorbants et leur preparation
JPS52130536A (en) 1976-04-26 1977-11-01 Toshiba Corp Semiconductor memory unit
US4099069A (en) 1976-10-08 1978-07-04 Westinghouse Electric Corp. Circuit producing a common clear signal for erasing selected arrays in a mnos memory system
US4398248A (en) 1980-10-20 1983-08-09 Mcdonnell Douglas Corporation Adaptive WSI/MNOS solid state memory system
JPS5821595Y2 (ja) 1977-10-18 1983-05-07 株式会社鶴見製作所 脱着式曝気装置における脱着構造
GB2020437B (en) 1978-04-14 1982-08-04 Seiko Instr & Electronics Voltage detecting circuit
US4210959A (en) 1978-05-10 1980-07-01 Apple Computer, Inc. Controller for magnetic disc, recorder, or the like
FR2426938A1 (fr) 1978-05-26 1979-12-21 Cii Honeywell Bull Dispositif de detection de secteurs defectueux et d'allocation de secteurs de remplacement dans une memoire a disques
JPS559260A (en) 1978-07-03 1980-01-23 Nec Corp Information processing system
JPS5821594Y2 (ja) 1979-12-27 1983-05-07 株式会社 西原環境衛生研究所 エアレ−シヨン装置
US4532590A (en) 1980-04-25 1985-07-30 Data General Corporation Data processing system having a unique address translation unit
US4355376A (en) 1980-09-30 1982-10-19 Burroughs Corporation Apparatus and method for utilizing partially defective memory devices
JPS5764383A (en) 1980-10-03 1982-04-19 Toshiba Corp Address converting method and its device
JPS57132256A (en) 1981-02-09 1982-08-16 Sony Corp Memory device
JPS5877034A (ja) 1981-10-30 1983-05-10 Hitachi Ltd 記録方法
US4473878A (en) 1981-11-23 1984-09-25 Motorola, Inc. Memory management unit
US4468730A (en) 1981-11-27 1984-08-28 Storage Technology Corporation Detection of sequential data stream for improvements in cache data storage
US4476526A (en) 1981-11-27 1984-10-09 Storage Technology Corporation Cache buffered memory subsystem
US4450559A (en) 1981-12-24 1984-05-22 International Business Machines Corporation Memory system with selective assignment of spare locations
US4498146A (en) 1982-07-30 1985-02-05 At&T Bell Laboratories Management of defects in storage media
JPS5945695U (ja) 1982-09-14 1984-03-26 ニツタン株式会社 火災警報設備
US4710871A (en) 1982-11-01 1987-12-01 Ncr Corporation Data transmitting and receiving apparatus
JPS59162695A (ja) 1983-03-07 1984-09-13 Nec Corp 記憶装置
US4609833A (en) 1983-08-12 1986-09-02 Thomson Components-Mostek Corporation Simple NMOS voltage reference circuit
US4896262A (en) 1984-02-24 1990-01-23 Kabushiki Kaisha Meidensha Emulation device for converting magnetic disc memory mode signal from computer into semiconductor memory access mode signal for semiconductor memory
JPS60212900A (ja) 1984-04-09 1985-10-25 Nec Corp 半導体固定記憶装置
JPS618798A (ja) 1984-06-21 1986-01-16 Nec Corp 不揮発性記憶装置
JPS6180597A (ja) 1984-09-26 1986-04-24 Hitachi Ltd 半導体記憶装置
JPS6196598U (fr) 1984-11-30 1986-06-21
US4654847A (en) 1984-12-28 1987-03-31 International Business Machines Apparatus for automatically correcting erroneous data and for storing the corrected data in a common pool alternate memory array
JPS61208673A (ja) 1985-03-12 1986-09-17 Matsushita Electric Ind Co Ltd 情報記録再生装置
US4744062A (en) 1985-04-23 1988-05-10 Hitachi, Ltd. Semiconductor integrated circuit with nonvolatile memory
US4829169A (en) 1985-07-01 1989-05-09 Toppan Moore Company, Inc. IC card having state marker for record access
JPH0635227B2 (ja) 1985-07-31 1994-05-11 トツパン・ム−ア株式会社 更新情報と履歴情報の読出し手段を有するｉｃカ−ド
JPS62102482A (ja) 1985-10-28 1987-05-12 Matsushita Electric Ind Co Ltd 情報記録再生装置
JP2664137B2 (ja) 1985-10-29 1997-10-15 凸版印刷株式会社 Ｉｃカード
US4800520A (en) 1985-10-29 1989-01-24 Kabushiki Kaisha Toshiba Portable electronic device with garbage collection function
US4752893A (en) 1985-11-06 1988-06-21 Texas Instruments Incorporated Graphics data processing apparatus having image operations with transparent color having a selectable number of bits
US4924331A (en) 1985-11-20 1990-05-08 Seagate Technology, Inc. Method for mapping around defective sectors in a disc drive
US4746998A (en) 1985-11-20 1988-05-24 Seagate Technology, Inc. Method for mapping around defective sectors in a disc drive
DE3640238A1 (de) 1985-11-30 1987-06-25 Toshiba Kawasaki Kk Tragbare elektronische vorrichtung
US4757474A (en) 1986-01-28 1988-07-12 Fujitsu Limited Semiconductor memory device having redundancy circuit portion
JPH07114499B2 (ja) 1986-12-24 1995-12-06 株式会社日立製作所 データ符号化方法
JP2685173B2 (ja) 1986-05-31 1997-12-03 キヤノン株式会社 メモリ書き込み制御方法
JPH07109717B2 (ja) 1986-05-31 1995-11-22 キヤノン株式会社 メモリ書き込み制御方法
SU1388877A1 (ru) 1986-09-16 1988-04-15 Таганрогский радиотехнический институт им.В.Д.Калмыкова Устройство дл адресации блоков пам ти
SU1408439A1 (ru) 1986-10-20 1988-07-07 Предприятие П/Я В-2129 Устройство адресации дл автоматической конфигурации пам ти ЭВМ
US4953122A (en) 1986-10-31 1990-08-28 Laserdrive Ltd. Pseudo-erasable and rewritable write-once optical disk memory system
JPS63183700A (ja) 1987-01-26 1988-07-29 Mitsubishi Electric Corp Ｅｅｐｒｏｍアクセス方法
JPH0636578Y2 (ja) 1987-04-10 1994-09-21 日本電気株式会社 半導体集積回路
JPS63183700U (fr) 1987-05-19 1988-11-25
JPS63198567U (fr) 1987-06-12 1988-12-21
JPS6473430A (en) 1987-09-14 1989-03-17 Hudson Soft Co Ltd Memory access control device
JPH081760B2 (ja) 1987-11-17 1996-01-10 三菱電機株式会社 半導体記憶装置
JPH01137817A (ja) 1987-11-25 1989-05-30 Toshiba Corp 遅延回路
JP2696864B2 (ja) 1987-11-25 1998-01-14 日本電気株式会社 メモリ装置
SU1515164A1 (ru) 1988-01-12 1989-10-15 Предприятие П/Я Г-4493 Устройство дл адресации к пам ти
SU1541619A1 (ru) 1988-05-30 1990-02-07 Предприятие П/Я Г-4173 Устройство дл формировани адреса
US5268870A (en) 1988-06-08 1993-12-07 Eliyahou Harari Flash EEPROM system and intelligent programming and erasing methods therefor
US5168465A (en) 1988-06-08 1992-12-01 Eliyahou Harari Highly compact EPROM and flash EEPROM devices
US5268319A (en) 1988-06-08 1993-12-07 Eliyahou Harari Highly compact EPROM and flash EEPROM devices
US5293560A (en) 1988-06-08 1994-03-08 Eliyahou Harari Multi-state flash EEPROM system using incremental programing and erasing methods
US5268318A (en) 1988-06-08 1993-12-07 Eliyahou Harari Highly compact EPROM and flash EEPROM devices
US5198380A (en) 1988-06-08 1993-03-30 Sundisk Corporation Method of highly compact EPROM and flash EEPROM devices
US4914529A (en) 1988-07-18 1990-04-03 Western Digital Corp. Data disk defect handling using relocation ID fields
US5070474A (en) 1988-07-26 1991-12-03 Disk Emulation Systems, Inc. Disk emulation system
JPH064399Y2 (ja) 1988-08-10 1994-02-02 株式会社セガ・エンタープライゼス 音発生装置
US5253351A (en) 1988-08-11 1993-10-12 Hitachi, Ltd. Memory controller with a cache memory and control method of cache memory including steps of determining memory access threshold values
SU1573458A2 (ru) 1988-09-26 1990-06-23 Войсковая Часть 32103 Устройство дл адресации
JPH0793499B2 (ja) 1989-01-10 1995-10-09 キヤノン株式会社 レーザーを用いた孔加工方法
US5535328A (en) 1989-04-13 1996-07-09 Sandisk Corporation Non-volatile memory system card with flash erasable sectors of EEprom cells including a mechanism for substituting defective cells
DE69033262T2 (de) 1989-04-13 2000-02-24 Sandisk Corp EEPROM-Karte mit Austauch von fehlerhaften Speicherzellen und Zwischenspeicher
US5226168A (en) 1989-04-25 1993-07-06 Seiko Epson Corporation Semiconductor memory configured to emulate floppy and hard disk magnetic storage based upon a determined storage capacity of the semiconductor memory
JPH02308738A (ja) 1989-05-22 1990-12-21 Masao Shiotani イセエビ用魚礁
US5200959A (en) 1989-10-17 1993-04-06 Sundisk Corporation Device and method for defect handling in semi-conductor memory
SU1686449A2 (ru) 1989-10-23 1991-10-23 Войсковая Часть 32103 Устройство дл адресации
US5247658A (en) 1989-10-31 1993-09-21 Microsoft Corporation Method and system for traversing linked list record based upon write-once predetermined bit value of secondary pointers
JPH03228377A (ja) 1990-02-02 1991-10-09 Toshiba Corp 半導体装置
US5218695A (en) 1990-02-05 1993-06-08 Epoch Systems, Inc. File server system having high-speed write execution
US5220518A (en) 1990-06-07 1993-06-15 Vlsi Technology, Inc. Integrated circuit memory with non-binary array configuration
JPH0451917Y2 (fr) 1990-09-20 1992-12-07
US5303198A (en) 1990-09-28 1994-04-12 Fuji Photo Film Co., Ltd. Method of recording data in memory card having EEPROM and memory card system using the same
EP0489204B1 (fr) 1990-12-04 1995-08-16 Hewlett-Packard Limited Support de données reprogrammable
JPH04216392A (ja) 1990-12-18 1992-08-06 Mitsubishi Electric Corp ブロックライト機能を備える半導体記憶装置
GB2251324B (en) 1990-12-31 1995-05-10 Intel Corp File structure for a non-volatile semiconductor memory
GB2251323B (en) 1990-12-31 1994-10-12 Intel Corp Disk emulation for a non-volatile semiconductor memory
JPH04268284A (ja) 1991-02-22 1992-09-24 Fuji Photo Film Co Ltd メモリカード
JP3126396B2 (ja) 1991-02-06 2001-01-22 株式会社東芝 不揮発性半導体記憶装置
JPH04278297A (ja) 1991-03-07 1992-10-02 Toshiba Corp 不揮発性半導体記憶装置
US5504760A (en) 1991-03-15 1996-04-02 Sandisk Corporation Mixed data encoding EEPROM system
US5270979A (en) 1991-03-15 1993-12-14 Sundisk Corporation Method for optimum erasing of EEPROM
US5396468A (en) 1991-03-15 1995-03-07 Sundisk Corporation Streamlined write operation for EEPROM system
US5663901A (en) 1991-04-11 1997-09-02 Sandisk Corporation Computer memory cards using flash EEPROM integrated circuit chips and memory-controller systems
US5430859A (en) 1991-07-26 1995-07-04 Sundisk Corporation Solid state memory system including plural memory chips and a serialized bus
DE69223099T2 (de) 1991-08-09 1998-06-10 Toshiba Kawasaki Kk Aufzeichnungsgerät für eine Speicherkarte
JP3229345B2 (ja) 1991-09-11 2001-11-19 ローム株式会社 不揮発性ｉｃメモリ
US5438573A (en) 1991-09-13 1995-08-01 Sundisk Corporation Flash EEPROM array data and header file structure
US6230233B1 (en) 1991-09-13 2001-05-08 Sandisk Corporation Wear leveling techniques for flash EEPROM systems
US5357462A (en) 1991-09-24 1994-10-18 Kabushiki Kaisha Toshiba Electrically erasable and programmable non-volatile semiconductor memory with automatic write-verify controller
US5778418A (en) 1991-09-27 1998-07-07 Sandisk Corporation Mass computer storage system having both solid state and rotating disk types of memory
US5227714A (en) 1991-10-07 1993-07-13 Brooktree Corporation Voltage regulator
US5640528A (en) 1991-10-24 1997-06-17 Intel Corporation Method and apparatus for translating addresses using mask and replacement value registers
US5315558A (en) 1991-10-25 1994-05-24 Vlsi Technology, Inc. Integrated circuit memory with non-binary array configuration
US5359569A (en) 1991-10-29 1994-10-25 Hitachi Ltd. Semiconductor memory
JPH05128877A (ja) 1991-11-07 1993-05-25 Mitsubishi Electric Corp 不揮発性半導体記憶装置
JPH05151097A (ja) 1991-11-28 1993-06-18 Fujitsu Ltd 書換回数制限型メモリのデータ管理方式
JP3171901B2 (ja) 1992-02-05 2001-06-04 セイコーインスツルメンツ株式会社 不揮発性メモリカードの書換え方法
JPH05233426A (ja) 1992-02-20 1993-09-10 Fujitsu Ltd フラッシュ・メモリ使用方法
US5371702A (en) 1992-03-05 1994-12-06 Kabushiki Kaisha Toshiba Block erasable nonvolatile memory device
FR2688333B1 (fr) 1992-03-06 1994-04-29 Sgc Thomson Microelectronics S Dispositif et procede d'effacement par secteurs d'une memoire flash eprom.
TW231343B (fr) * 1992-03-17 1994-10-01 Hitachi Seisakusyo Kk
JP2830594B2 (ja) 1992-03-26 1998-12-02 日本電気株式会社 半導体メモリ装置
JP3485938B2 (ja) * 1992-03-31 2004-01-13 株式会社東芝 不揮発性半導体メモリ装置
US5267218A (en) 1992-03-31 1993-11-30 Intel Corporation Nonvolatile memory card with a single power supply input
JP3323869B2 (ja) 1992-03-31 2002-09-09 株式会社東芝 不揮発性半導体メモリ装置
US5532962A (en) 1992-05-20 1996-07-02 Sandisk Corporation Soft errors handling in EEPROM devices
US5381539A (en) 1992-06-04 1995-01-10 Emc Corporation System and method for dynamically controlling cache management
DE4219145C1 (de) 1992-06-11 1994-03-17 Emitec Emissionstechnologie Verfahren und Vorrichtung zum Beloten eines metallischen Wabenkörpers
JP3328321B2 (ja) 1992-06-22 2002-09-24 株式会社日立製作所 半導体記憶装置
JPH0612863A (ja) 1992-06-26 1994-01-21 Toshiba Corp デュアルポートｄｒａｍ
US5592415A (en) * 1992-07-06 1997-01-07 Hitachi, Ltd. Non-volatile semiconductor memory
US5315541A (en) 1992-07-24 1994-05-24 Sundisk Corporation Segmented column memory array
JP2768618B2 (ja) 1992-08-28 1998-06-25 シャープ株式会社 半導体ディスク装置
JPH06103748A (ja) 1992-09-16 1994-04-15 Mitsubishi Electric Corp Ｉｃメモリカードの電源制御回路
US5428621A (en) 1992-09-21 1995-06-27 Sundisk Corporation Latent defect handling in EEPROM devices
JP3105092B2 (ja) 1992-10-06 2000-10-30 株式会社東芝 半導体メモリ装置
JP3177015B2 (ja) 1992-10-14 2001-06-18 株式会社東芝 半導体メモリ装置の制御方法
JPH06131889A (ja) 1992-10-14 1994-05-13 Toshiba Corp 半導体ファイル装置
JPH06132747A (ja) 1992-10-20 1994-05-13 Fujitsu Ltd 半導体装置
JP3641280B2 (ja) 1992-10-30 2005-04-20 インテル・コーポレーション フラッシュｅｅｐｒｏｍアレイのクリーン・アップすべきブロックを決定する方法
US5822781A (en) 1992-10-30 1998-10-13 Intel Corporation Sector-based storage device emulator having variable-sized sector
US5357475A (en) 1992-10-30 1994-10-18 Intel Corporation Method for detaching sectors in a flash EEPROM memory array
US5341330A (en) 1992-10-30 1994-08-23 Intel Corporation Method for writing to a flash memory array during erase suspend intervals
US5337275A (en) 1992-10-30 1994-08-09 Intel Corporation Method for releasing space in flash EEPROM memory array to allow the storage of compressed data
US5734567A (en) * 1992-11-06 1998-03-31 Siemens Aktiengesellschaft Diagnosis system for a plant
JPH06149395A (ja) 1992-11-12 1994-05-27 Nec Corp 半導体装置
JPH06236686A (ja) 1993-01-22 1994-08-23 Nec Corp 半導体装置
US5581723A (en) 1993-02-19 1996-12-03 Intel Corporation Method and apparatus for retaining flash block structure data during erase operations in a flash EEPROM memory array
JP2856621B2 (ja) * 1993-02-24 1999-02-10 インターナショナル・ビジネス・マシーンズ・コーポレイション 一括消去型不揮発性メモリおよびそれを用いる半導体ディスク装置
US5812814A (en) 1993-02-26 1998-09-22 Kabushiki Kaisha Toshiba Alternative flash EEPROM semiconductor memory system
JP3594626B2 (ja) 1993-03-04 2004-12-02 株式会社ルネサステクノロジ 不揮発性メモリ装置
US5404485A (en) 1993-03-08 1995-04-04 M-Systems Flash Disk Pioneers Ltd. Flash file system
JPH06266596A (ja) 1993-03-11 1994-09-22 Hitachi Ltd フラッシュメモリファイル記憶装置および情報処理装置
JP3477781B2 (ja) 1993-03-23 2003-12-10 セイコーエプソン株式会社 Ｉｃカード
US5479638A (en) 1993-03-26 1995-12-26 Cirrus Logic, Inc. Flash memory mass storage architecture incorporation wear leveling technique
US5485595A (en) 1993-03-26 1996-01-16 Cirrus Logic, Inc. Flash memory mass storage architecture incorporating wear leveling technique without using cam cells
US5388083A (en) 1993-03-26 1995-02-07 Cirrus Logic, Inc. Flash memory mass storage architecture
JP3330187B2 (ja) 1993-05-13 2002-09-30 株式会社リコー メモリカード
US5329491A (en) 1993-06-30 1994-07-12 Intel Corporation Nonvolatile memory card with automatic power supply configuration
US5353256A (en) 1993-06-30 1994-10-04 Intel Corporation Block specific status information in a memory device
US5519847A (en) 1993-06-30 1996-05-21 Intel Corporation Method of pipelining sequential writes in a flash memory
US5422842A (en) 1993-07-08 1995-06-06 Sundisk Corporation Method and circuit for simultaneously programming and verifying the programming of selected EEPROM cells
JP3228377B2 (ja) 1993-07-19 2001-11-12 東京電力株式会社 溶融炭酸塩型燃料電池カソードとその溶解抑制方法
US5465338A (en) 1993-08-24 1995-11-07 Conner Peripherals, Inc. Disk drive system interface architecture employing state machines
US5566314A (en) 1993-08-30 1996-10-15 Lucent Technologies Inc. Flash memory device employing unused cell arrays to update files
JP2922116B2 (ja) 1993-09-02 1999-07-19 株式会社東芝 半導体記憶装置
JP3683915B2 (ja) 1993-09-24 2005-08-17 株式会社東芝 半導体記憶装置
JP3215237B2 (ja) 1993-10-01 2001-10-02 富士通株式会社 記憶装置および記憶装置の書き込み／消去方法
US5365127A (en) 1993-10-18 1994-11-15 Hewlett-Packard Company Circuit for conversion from CMOS voltage levels to shifted ECL voltage levels with process compensation
JPH0818018B2 (ja) 1993-11-29 1996-02-28 英和 室谷 薬品注入による下水の硫化水素の制御方法と装置
JPH07235193A (ja) 1993-12-28 1995-09-05 Toshiba Corp 半導体記憶装置
SG45399A1 (en) 1994-01-12 1998-01-16 Sun Microsystems Inc Logically addressable physical memory for a virtual memory computer system that support multiple page sizes
US5473765A (en) 1994-01-24 1995-12-05 3Com Corporation Apparatus for using flash memory as a floppy disk emulator in a computer system
US6026027A (en) * 1994-01-31 2000-02-15 Norand Corporation Flash memory system having memory cache
US5482595A (en) * 1994-03-22 1996-01-09 Betz Paperchem, Inc. Method for improving retention and drainage characteristics in alkaline papermaking
US5661053A (en) 1994-05-25 1997-08-26 Sandisk Corporation Method of making dense flash EEPROM cell array and peripheral supporting circuits formed in deposited field oxide with the use of spacers
US5603001A (en) * 1994-05-09 1997-02-11 Kabushiki Kaisha Toshiba Semiconductor disk system having a plurality of flash memories
JPH07311708A (ja) 1994-05-18 1995-11-28 Fuji Film Micro Device Kk メモリカード
JP3307777B2 (ja) * 1994-07-07 2002-07-24 栄修 永田 ハンダ付け方法および装置
JPH0869696A (ja) 1994-08-31 1996-03-12 Toshiba Corp 半導体記憶装置
US5809558A (en) 1994-09-29 1998-09-15 Intel Corporation Method and data storage system for storing data in blocks without file reallocation before erasure
US5508971A (en) * 1994-10-17 1996-04-16 Sandisk Corporation Programmable power generation circuit for flash EEPROM memory systems
US5606660A (en) * 1994-10-21 1997-02-25 Lexar Microsystems, Inc. Method and apparatus for combining controller firmware storage and controller logic in a mass storage system
JP2669365B2 (ja) 1994-11-24 1997-10-27 日本電気株式会社 書換え可能なｒｏｍファイル装置
US5537077A (en) 1994-12-23 1996-07-16 Advanced Micro Devices, Inc. Power supply dependent method of controlling a charge pump
US5847552A (en) 1995-01-24 1998-12-08 Dell Usa, L.P. Integrated circuit with determinate power source control
JPH08212019A (ja) 1995-01-31 1996-08-20 Mitsubishi Electric Corp 半導体ディスク装置
JPH08263361A (ja) 1995-03-23 1996-10-11 Mitsubishi Electric Corp フラッシュメモリカード
US5818350A (en) 1995-04-11 1998-10-06 Lexar Microsystems Inc. High performance method of and system for selecting one of a plurality of IC chip while requiring minimal select lines
JP4254994B2 (ja) 1995-05-29 2009-04-15 株式会社日立製作所 デイスポーザブルな反応容器を用いる分析装置
US6072796A (en) 1995-06-14 2000-06-06 Avid Technology, Inc. Apparatus and method for accessing memory in a TDM network
US5723990A (en) * 1995-06-21 1998-03-03 Micron Quantum Devices, Inc. Integrated circuit having high voltage detection circuit
US5552698A (en) 1995-06-29 1996-09-03 United Microelectronics Corp. Voltage supply system for IC chips
US5627416A (en) 1995-07-21 1997-05-06 Itt Corporation Multi-voltage IC card host
US6978342B1 (en) 1995-07-31 2005-12-20 Lexar Media, Inc. Moving sectors within a block of information in a flash memory mass storage architecture
US5907856A (en) 1995-07-31 1999-05-25 Lexar Media, Inc. Moving sectors within a block of information in a flash memory mass storage architecture
US5838614A (en) 1995-07-31 1998-11-17 Lexar Microsystems, Inc. Identification and verification of a sector within a block of mass storage flash memory
US6728851B1 (en) * 1995-07-31 2004-04-27 Lexar Media, Inc. Increasing the memory performance of flash memory devices by writing sectors simultaneously to multiple flash memory devices
US6081878A (en) 1997-03-31 2000-06-27 Lexar Media, Inc. Increasing the memory performance of flash memory devices by writing sectors simultaneously to multiple flash memory devices
US6757800B1 (en) 1995-07-31 2004-06-29 Lexar Media, Inc. Increasing the memory performance of flash memory devices by writing sectors simultaneously to multiple flash memory devices
US5845313A (en) 1995-07-31 1998-12-01 Lexar Direct logical block addressing flash memory mass storage architecture
US5930815A (en) 1995-07-31 1999-07-27 Lexar Media, Inc. Moving sequential sectors within a block of information in a flash memory mass storage architecture
US5596526A (en) * 1995-08-15 1997-01-21 Lexar Microsystems, Inc. Non-volatile memory system of multi-level transistor cells and methods using same
JPH0954726A (ja) 1995-08-18 1997-02-25 Mitsubishi Electric Corp 記憶装置
JPH0969295A (ja) 1995-08-31 1997-03-11 Sanyo Electric Co Ltd 不揮発性多値メモリ装置
US5835935A (en) 1995-09-13 1998-11-10 Lexar Media, Inc. Method of and architecture for controlling system data with automatic wear leveling in a semiconductor non-volatile mass storage memory
US6125435A (en) 1995-09-13 2000-09-26 Lexar Media, Inc. Alignment of cluster address to block addresses within a semiconductor non-volatile mass storage memory
GB2291991A (en) 1995-09-27 1996-02-07 Memory Corp Plc Disk drive emulation with a block-erasable memory
GB2291990A (en) 1995-09-27 1996-02-07 Memory Corp Plc Flash-memory management system
US5809560A (en) 1995-10-13 1998-09-15 Compaq Computer Corporation Adaptive read-ahead disk cache
KR100253868B1 (ko) 1995-11-13 2000-05-01 니시무로 타이죠 불휘발성 반도체기억장치
CN1202255A (zh) 1995-11-13 1998-12-16 勒克萨微型系统股份有限公司 复合电压应用中的自动电压检测
JPH09147581A (ja) 1995-11-21 1997-06-06 Hitachi Ltd 半導体記憶装置、及びデータ処理装置
US5799168A (en) 1996-01-05 1998-08-25 M-Systems Flash Disk Pioneers Ltd. Standardized flash controller
JPH09212411A (ja) 1996-02-06 1997-08-15 Tokyo Electron Ltd メモリシステム
US5724303A (en) * 1996-02-15 1998-03-03 Nexcom Technology, Inc. Non-volatile programmable memory having an SRAM capability
US5787445A (en) 1996-03-07 1998-07-28 Norris Communications Corporation Operating system including improved file management for use in devices utilizing flash memory as main memory
US5822252A (en) 1996-03-29 1998-10-13 Aplus Integrated Circuits, Inc. Flash memory wordline decoder with overerase repair
GB9606927D0 (en) 1996-04-02 1996-06-05 Memory Corp Plc Data storage devices
GB9606928D0 (en) 1996-04-02 1996-06-05 Memory Corp Plc Memory devices
US5991849A (en) 1996-04-10 1999-11-23 Sanyo Electric Co., Ltd Rewriting protection of a size varying first region of a reprogrammable non-volatile memory
GB9609833D0 (en) 1996-05-10 1996-07-17 Memory Corp Plc Memory device
US5959926A (en) 1996-06-07 1999-09-28 Dallas Semiconductor Corp. Programmable power supply systems and methods providing a write protected memory having multiple interface capability
JP3493096B2 (ja) * 1996-06-07 2004-02-03 株式会社東芝 半導体集積回路、ｉｃカード、及びｉｃカードシステム
GB9613088D0 (en) 1996-06-21 1996-08-28 Memory Corp Plc Memory device
US5758100A (en) 1996-07-01 1998-05-26 Sun Microsystems, Inc. Dual voltage module interconnect
GB9614551D0 (en) 1996-07-11 1996-09-04 Memory Corp Plc Memory system
US5757712A (en) * 1996-07-12 1998-05-26 International Business Machines Corporation Memory modules with voltage regulation and level translation
JP3761635B2 (ja) 1996-07-12 2006-03-29 株式会社ダックス メモリボード、メモリアクセス方法及びメモリアクセス装置
US5787484A (en) 1996-08-08 1998-07-28 Micron Technology, Inc. System and method which compares data preread from memory cells to data to be written to the cells
US6021408A (en) * 1996-09-12 2000-02-01 Veritas Software Corp. Methods for operating a log device
US5920884A (en) 1996-09-24 1999-07-06 Hyundai Electronics America, Inc. Nonvolatile memory interface protocol which selects a memory device, transmits an address, deselects the device, subsequently reselects the device and accesses data
US5860124A (en) * 1996-09-30 1999-01-12 Intel Corporation Method for performing a continuous over-write of a file in nonvolatile memory
GB2317722B (en) * 1996-09-30 2001-07-18 Nokia Mobile Phones Ltd Memory device
US5754567A (en) * 1996-10-15 1998-05-19 Micron Quantum Devices, Inc. Write reduction in flash memory systems through ECC usage
US6047352A (en) * 1996-10-29 2000-04-04 Micron Technology, Inc. Memory system, method and predecoding circuit operable in different modes for selectively accessing multiple blocks of memory cells for simultaneous writing or erasure
US5890192A (en) * 1996-11-05 1999-03-30 Sandisk Corporation Concurrent write of multiple chunks of data into multiple subarrays of flash EEPROM
US5909586A (en) 1996-11-06 1999-06-01 The Foxboro Company Methods and systems for interfacing with an interface powered I/O device
US5956473A (en) 1996-11-25 1999-09-21 Macronix International Co., Ltd. Method and system for managing a flash memory mass storage system
US5745418A (en) * 1996-11-25 1998-04-28 Macronix International Co., Ltd. Flash memory mass storage system
JPH10154101A (ja) * 1996-11-26 1998-06-09 Toshiba Corp データ記憶システム及び同システムに適用するキャッシュ制御方法
JPH10177797A (ja) 1996-12-17 1998-06-30 Toshiba Corp 半導体記憶装置
JPH10187505A (ja) * 1996-12-24 1998-07-21 Toshiba Corp 情報記憶システム及び同システムに適用するデータ配置方法
US5901086A (en) 1996-12-26 1999-05-04 Motorola, Inc. Pipelined fast-access floating gate memory architecture and method of operation
US6279069B1 (en) 1996-12-26 2001-08-21 Intel Corporation Interface for flash EEPROM memory arrays
US5928370A (en) 1997-02-05 1999-07-27 Lexar Media, Inc. Method and apparatus for verifying erasure of memory blocks within a non-volatile memory structure
US5822245A (en) 1997-03-26 1998-10-13 Atmel Corporation Dual buffer flash memory architecture with multiple operating modes
US6034897A (en) * 1999-04-01 2000-03-07 Lexar Media, Inc. Space management for managing high capacity nonvolatile memory
US6411546B1 (en) 1997-03-31 2002-06-25 Lexar Media, Inc. Nonvolatile memory using flexible erasing methods and method and system for using same
US6122195A (en) 1997-03-31 2000-09-19 Lexar Media, Inc. Method and apparatus for decreasing block write operation times performed on nonvolatile memory
US5953737A (en) 1997-03-31 1999-09-14 Lexar Media, Inc. Method and apparatus for performing erase operations transparent to a solid state storage system
US5831929A (en) 1997-04-04 1998-11-03 Micron Technology, Inc. Memory device with staggered data paths
JP3592887B2 (ja) * 1997-04-30 2004-11-24 株式会社東芝 不揮発性半導体記憶装置
US6011322A (en) * 1997-07-28 2000-01-04 Sony Corporation Apparatus and method for providing power to circuitry implementing two different power sources
US6226708B1 (en) 1997-08-18 2001-05-01 Texas Instruments Incorporated Method and system for efficiently programming non-volatile memory
US6011323A (en) * 1997-09-30 2000-01-04 International Business Machines Corporation Apparatus, method and article of manufacture providing for auxiliary battery conservation in adapters
JP4278297B2 (ja) 1997-10-08 2009-06-10 ヒューレット・パッカード・カンパニー 液晶装置の配向
US5937425A (en) 1997-10-16 1999-08-10 M-Systems Flash Disk Pioneers Ltd. Flash file system optimized for page-mode flash technologies
JPH11224492A (ja) 1997-11-06 1999-08-17 Toshiba Corp 半導体記憶装置、不揮発性半導体記憶装置及びフラッシュメモリ
US6018265A (en) * 1997-12-10 2000-01-25 Lexar Media, Inc. Internal CMOS reference generator and voltage regulator
US6076137A (en) 1997-12-11 2000-06-13 Lexar Media, Inc. Method and apparatus for storing location identification information within non-volatile memory devices
GB9801373D0 (en) 1998-01-22 1998-03-18 Memory Corp Plc Memory system
US5969986A (en) 1998-06-23 1999-10-19 Invox Technology High-bandwidth read and write architectures for non-volatile memories
US6182162B1 (en) * 1998-03-02 2001-01-30 Lexar Media, Inc. Externally coupled compact flash memory card that configures itself one of a plurality of appropriate operating protocol modes of a host computer
WO1999045460A2 (fr) * 1998-03-02 1999-09-10 Lexar Media, Inc. Carte memoire flash avec detection du mode de fonctionnement amelioree et systeme d'interface convivial
US6040997A (en) * 1998-03-25 2000-03-21 Lexar Media, Inc. Flash memory leveling architecture having no external latch
GB9806687D0 (en) 1998-03-27 1998-05-27 Memory Corp Plc Memory system
US6055184A (en) * 1998-09-02 2000-04-25 Texas Instruments Incorporated Semiconductor memory device having programmable parallel erase operation
US6279114B1 (en) 1998-11-04 2001-08-21 Sandisk Corporation Voltage negotiation in a single host multiple cards system
US6490649B2 (en) 1998-11-10 2002-12-03 Lexar Media, Inc. Memory device
AU1729100A (en) * 1998-11-17 2000-06-05 Lexar Media, Inc. Method and apparatus for memory control circuit
GB9903490D0 (en) * 1999-02-17 1999-04-07 Memory Corp Plc Memory system
US6041001A (en) * 1999-02-25 2000-03-21 Lexar Media, Inc. Method of increasing data reliability of a flash memory device without compromising compatibility
US6104638A (en) * 1999-02-26 2000-08-15 Hewlett-Packard Company Use of erasable non-volatile memory for storage of changing information
US6084483A (en) 1999-03-10 2000-07-04 Lexar Media, Inc. Internal oscillator circuit including a ring oscillator controlled by a voltage regulator circuit
EP1228510B1 (fr) 1999-04-01 2006-09-20 Lexar Media, Inc. Gestion d'espace pour la gestion d'une memoire non volatile haute capacite
US6141249A (en) 1999-04-01 2000-10-31 Lexar Media, Inc. Organization of blocks within a nonvolatile memory unit to effectively decrease sector write operation time
US6181118B1 (en) * 1999-06-24 2001-01-30 Analog Devices, Inc. Control circuit for controlling a semi-conductor switch for selectively outputting an output voltage at two voltage levels
JP4268284B2 (ja) 1999-09-20 2009-05-27 積水化学工業株式会社 光硬化性樹脂組成物、液晶注入口封止剤及び液晶表示セル
US6721843B1 (en) * 2000-07-07 2004-04-13 Lexar Media, Inc. Flash memory architecture implementing simultaneously programmable multiple flash memory banks that are host compatible
US6567307B1 (en) 2000-07-21 2003-05-20 Lexar Media, Inc. Block management for mass storage
US6772274B1 (en) 2000-09-13 2004-08-03 Lexar Media, Inc. Flash memory system and method implementing LBA to PBA correlation within flash memory array
TW539946B (en) * 2001-08-07 2003-07-01 Solid State System Company Ltd Window-based flash memory storage system, and the management method and the access method thereof
EP1286267B1 (fr) * 2001-08-17 2017-08-16 Sony Deutschland GmbH Dispositif de communication mobile et procédé de gestion de mémoire
US6948026B2 (en) * 2001-08-24 2005-09-20 Micron Technology, Inc. Erase block management
GB2411499B (en) 2001-09-28 2006-02-08 Lexar Media Inc Method of writing data to non-volatile memory
GB0123415D0 (en) 2001-09-28 2001-11-21 Memquest Ltd Method of writing data to non-volatile memory
GB0123416D0 (en) 2001-09-28 2001-11-21 Memquest Ltd Non-volatile memory control
GB0123410D0 (en) 2001-09-28 2001-11-21 Memquest Ltd Memory system for data storage and retrieval
GB0123422D0 (en) * 2001-09-28 2001-11-21 Memquest Ltd Improved memory controller
GB0123419D0 (en) 2001-09-28 2001-11-21 Memquest Ltd Data handling system
GB0123412D0 (en) 2001-09-28 2001-11-21 Memquest Ltd Memory system sectors
US6957295B1 (en) 2002-01-18 2005-10-18 Lexar Media, Inc. File management of one-time-programmable nonvolatile memory devices
US6950918B1 (en) 2002-01-18 2005-09-27 Lexar Media, Inc. File management of one-time-programmable nonvolatile memory devices
US6973519B1 (en) 2003-06-03 2005-12-06 Lexar Media, Inc. Card identification compatibility
JP5128877B2 (ja) 2007-08-28 2013-01-23 三協立山株式会社 開口部装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522780A2 (fr) * 1991-07-12 1993-01-13 International Business Machines Corporation Procédé de commande pour un dispositif mémoire d'ordinateur
US6275436B1 (en) * 1993-04-08 2001-08-14 Hitachi, Ltd Flash memory control method and apparatus processing system therewith

Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7383375B2 (en) 2003-12-30 2008-06-03 Sandisk Corporation Data run programming
US7139864B2 (en) 2003-12-30 2006-11-21 Sandisk Corporation Non-volatile memory and method with block management system
EP1758027A2 (fr) 2003-12-30 2007-02-28 SanDisk Corporation Mémoire non volatile et procédé avec gestion de données de commande
US7913061B2 (en) 2003-12-30 2011-03-22 Sandisk Corporation Non-volatile memory and method with memory planes alignment
WO2005066972A1 (fr) 2003-12-30 2005-07-21 Sandisk Corporation Memoire non volatile et procede de systeme de gestion de blocs
US7433993B2 (en) 2003-12-30 2008-10-07 San Disk Corportion Adaptive metablocks
DE102004063757A1 (de) * 2004-12-29 2006-07-13 Francotyp-Postalia Ag & Co. Kg Verfahren und Anordnung zum Manipulieren des Inhalts eines Datenspeichers
US7346743B2 (en) 2004-12-29 2008-03-18 Francotyp-Postalia Gmbh Excluding a toggle bit from the range of cacheable addresses in a flash memory
US7315917B2 (en) 2005-01-20 2008-01-01 Sandisk Corporation Scheduling of housekeeping operations in flash memory systems
US8364883B2 (en) 2005-01-20 2013-01-29 Sandisk Technologies Inc. Scheduling of housekeeping operations in flash memory systems
US7565478B2 (en) 2005-01-20 2009-07-21 Sandisk Corporation Scheduling of housekeeping operations in flash memory systems
EP1934752A1 (fr) * 2005-10-07 2008-06-25 Microsoft Corporation Gestion de memoire flash
EP1934752A4 (fr) * 2005-10-07 2009-04-08 Microsoft Corp Gestion de memoire flash
US7631162B2 (en) 2005-10-27 2009-12-08 Sandisck Corporation Non-volatile memory with adaptive handling of data writes
US7509471B2 (en) 2005-10-27 2009-03-24 Sandisk Corporation Methods for adaptively handling data writes in non-volatile memories
US7516267B2 (en) 2005-11-03 2009-04-07 Intel Corporation Recovering from a non-volatile memory failure
WO2007056106A3 (fr) * 2005-11-03 2007-11-08 Intel Corp Récupération après panne d’une mémoire non volatile
WO2007056106A2 (fr) * 2005-11-03 2007-05-18 Intel Corporation Récupération après panne d’une mémoire non volatile
CN101300554B (zh) * 2005-11-03 2012-07-04 英特尔公司 非易失性存储器故障的恢复
US7774392B2 (en) 2006-09-15 2010-08-10 Sandisk Corporation Non-volatile memory with management of a pool of update memory blocks based on each block's activity and data order
US7779056B2 (en) 2006-09-15 2010-08-17 Sandisk Corporation Managing a pool of update memory blocks based on each block's activity and data order
WO2010078222A1 (fr) 2009-01-05 2010-07-08 Sandisk Corporation Mémoire non volatile et procédé avec partitionnement de cache d'écriture
WO2010078540A2 (fr) 2009-01-05 2010-07-08 Sandisk Corporation Gestion de blocs de réserve dans des mémoires non volatiles
US8094500B2 (en) 2009-01-05 2012-01-10 Sandisk Technologies Inc. Non-volatile memory and method with write cache partitioning
US8700840B2 (en) 2009-01-05 2014-04-15 SanDisk Technologies, Inc. Nonvolatile memory with write cache having flush/eviction methods
US8244960B2 (en) 2009-01-05 2012-08-14 Sandisk Technologies Inc. Non-volatile memory and method with write cache partition management methods
US8040744B2 (en) 2009-01-05 2011-10-18 Sandisk Technologies Inc. Spare block management of non-volatile memories
WO2011075597A1 (fr) 2009-12-18 2011-06-23 Sandisk Corporation Flux de transfert de données destiné à un pliage sur puce
WO2011075572A1 (fr) 2009-12-18 2011-06-23 Sandisk Corporation Gestion de mises à jour d'une mémoire multi-niveaux non volatile dans une mémoire binaire non volatile
US8468294B2 (en) 2009-12-18 2013-06-18 Sandisk Technologies Inc. Non-volatile memory with multi-gear control using on-chip folding of data
WO2011075594A1 (fr) 2009-12-18 2011-06-23 Sandisk Corporation Mémoire non volatile à contrôle à vitesses multiples utilisant un pliage sur puce de données
WO2011082005A1 (fr) * 2009-12-30 2011-07-07 Sandisk Corporation Micro-architecture de mise à jour pour tables d'adresses
US8335907B2 (en) 2009-12-30 2012-12-18 Sandisk Technologies Inc. Micro-update architecture for address tables
US8417876B2 (en) 2010-06-23 2013-04-09 Sandisk Technologies Inc. Use of guard bands and phased maintenance operations to avoid exceeding maximum latency requirements in non-volatile memory systems
US8543757B2 (en) 2010-06-23 2013-09-24 Sandisk Technologies Inc. Techniques of maintaining logical to physical mapping information in non-volatile memory systems
WO2011162973A1 (fr) 2010-06-23 2011-12-29 Sandisk Technologies Inc. Utilisation de bandes de garde et d'opérations d'entretien par étapes pour éviter de dépasser des exigences de latence maximale dans systèmes de mémoire non volatile
US9342446B2 (en) 2011-03-29 2016-05-17 SanDisk Technologies, Inc. Non-volatile memory system allowing reverse eviction of data updates to non-volatile binary cache
US11830546B2 (en) 2011-07-19 2023-11-28 Vervain, Llc Lifetime mixed level non-volatile memory system
US11967369B2 (en) 2011-07-19 2024-04-23 Vervain, Llc Lifetime mixed level non-volatile memory system
US11854612B1 (en) 2011-07-19 2023-12-26 Vervain, Llc Lifetime mixed level non-volatile memory system
US8897080B2 (en) 2012-09-28 2014-11-25 Sandisk Technologies Inc. Variable rate serial to parallel shift register
US9490035B2 (en) 2012-09-28 2016-11-08 SanDisk Technologies, Inc. Centralized variable rate serializer and deserializer for bad column management
US9076506B2 (en) 2012-09-28 2015-07-07 Sandisk Technologies Inc. Variable rate parallel to serial shift register
US10114562B2 (en) 2014-09-16 2018-10-30 Sandisk Technologies Llc Adaptive block allocation in nonvolatile memory
US10032524B2 (en) 2015-02-09 2018-07-24 Sandisk Technologies Llc Techniques for determining local interconnect defects
US9817593B1 (en) 2016-07-11 2017-11-14 Sandisk Technologies Llc Block management in non-volatile memory system with non-blocking control sync system
US11967370B1 (en) 2023-12-20 2024-04-23 Vervain, Llc Lifetime mixed level non-volatile memory system

Also Published As

Publication number Publication date
EP1430386B1 (fr) 2007-01-24
US20030165076A1 (en) 2003-09-04
US20140244913A1 (en) 2014-08-28
DE60217883T2 (de) 2007-11-08
ATE408861T1 (de) 2008-10-15
EP1693739B1 (fr) 2008-09-17
GB0123415D0 (en) 2001-11-21
US8386695B2 (en) 2013-02-26
GB2384072B (en) 2005-12-07
US8694722B2 (en) 2014-04-08
US20130138873A1 (en) 2013-05-30
ATE352810T1 (de) 2007-02-15
EP1430386A1 (fr) 2004-06-23
US9489301B2 (en) 2016-11-08
EP1693739A1 (fr) 2006-08-23
GB2384072A (en) 2003-07-16
DE60229010D1 (de) 2008-10-30
DE60217883D1 (de) 2007-03-15
GB0222503D0 (en) 2002-11-06
US20080155184A1 (en) 2008-06-26
US7340581B2 (en) 2008-03-04

Similar Documents

Publication Publication Date Title
EP1430386B1 (fr) Procede d'ecriture de donnees dans une memoire non volatile
US6898662B2 (en) Memory system sectors
EP1451673B1 (fr) Commande de memoire non volatile
US8433846B2 (en) Methods and apparatus reading erase block management data in subsets of sectors having user data and control data sections
US8041884B2 (en) Controller for non-volatile memories and methods of operating the memory controller
US7783845B2 (en) Structures for the management of erase operations in non-volatile memories
US7624239B2 (en) Methods for the management of erase operations in non-volatile memories
WO2010144587A2 (fr) Système de mémoire ayant une récupération de place persistante
JP2005516264A (ja) 不揮発性メモリ上で実行されるブロック書き込み動作時間を低減させる方法および装置
GB2411499A (en) Maintaining erased blocks in a non-volatile memory
JP4829202B2 (ja) 記憶装置及びメモリ制御方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BY BZ CA CH CN CO CR CU CZ DE DM DZ EC EE ES FI GB GD GE GH HR HU ID IL IN IS JP KE KG KP KR LC LK LR LS LT LU LV MA MD MG MN MW MX MZ NO NZ OM PH PL PT RU SD SE SG SI SK SL TJ TM TN TR TZ UA UG US UZ VC VN YU ZA ZM

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ UG ZM ZW AM AZ BY KG KZ RU TJ TM AT BE BG CH CY CZ DK EE ES FI FR GB GR IE IT LU MC PT SE SK TR BF BJ CF CG CI GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
WWE Wipo information: entry into national phase

Ref document number: 2002760436

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 2002760436

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP

WWG Wipo information: grant in national office

Ref document number: 2002760436

Country of ref document: EP